fix(fetch): fix fetch failed

[MaineK00n]

What did you implement:

Fixes a bug that caused fetch to fail with the error Failed to delete: FOREIGN KEY constraint failed.

// fetch fail
// go-exploitdb checkout commit: ace20b83844f70379a7ed0c696b1170dc393b59b
$ go-exploitdb.ace20b8 fetch exploitdb
INFO[06-25|05:24:38] Fetching Offensive Security Exploit 
INFO[06-25|05:24:38] Fetching                                 URL=https://cve.mitre.org/data/downloads/allitems-cvrf.xml
INFO[06-25|05:25:25] Fetching                                 URL=https://raw.githubusercontent.com/offensive-security/exploitdb/master/files_shellcodes.csv
INFO[06-25|05:25:25] Fetching                                 URL=https://raw.githubusercontent.com/offensive-security/exploitdb/master/files_exploits.csv
INFO[06-25|05:25:25] Offensive Security Exploit               count=46825
INFO[06-25|05:25:25] Insert Exploit into go-exploitdb.        db=sqlite3
INFO[06-25|05:25:25] Inserting 46825 Exploits 
46825 / 46825 [-----------------------------------------------------------------------] 100.00% 8289 p/s
INFO[06-25|05:25:31] No CveID Exploit Count                   count=34187
INFO[06-25|05:25:31] CveID Exploit Count                      count=12638

$ go-exploitdb.ace20b8 fetch exploitdb
INFO[06-25|05:25:35] Fetching Offensive Security Exploit 
INFO[06-25|05:25:35] Fetching                                 URL=https://cve.mitre.org/data/downloads/allitems-cvrf.xml
INFO[06-25|05:26:07] Fetching                                 URL=https://raw.githubusercontent.com/offensive-security/exploitdb/master/files_shellcodes.csv
INFO[06-25|05:26:07] Fetching                                 URL=https://raw.githubusercontent.com/offensive-security/exploitdb/master/files_exploits.csv
INFO[06-25|05:26:07] Offensive Security Exploit               count=46825
INFO[06-25|05:26:07] Insert Exploit into go-exploitdb.        db=sqlite3
INFO[06-25|05:26:07] Inserting 46825 Exploits 
0 / 46825 [________________________________________________________________________________] 0.00% ? p/s
EROR[06-25|05:26:08] Failed to insert.                        dbpath=/home/mainek00n/github/github.com/MaineK00n/go-exploitdb/go-exploitdb.sqlite3 err="Failed to delete: FOREIGN KEY constraint failed"
Failed to delete: FOREIGN KEY constraint failed

Type of change

• Bug fix (non-breaking change which fixes an issue)

How Has This Been Tested?

// fetch success
// go-exploitdb checkout commit: ace20b83844f70379a7ed0c696b1170dc393b59b
$ go-exploitdb.ace20b8 fetch exploitdb
INFO[06-25|05:27:34] Fetching Offensive Security Exploit 
INFO[06-25|05:27:34] Fetching                                 URL=https://cve.mitre.org/data/downloads/allitems-cvrf.xml
INFO[06-25|05:28:03] Fetching                                 URL=https://raw.githubusercontent.com/offensive-security/exploitdb/master/files_shellcodes.csv
INFO[06-25|05:28:03] Fetching                                 URL=https://raw.githubusercontent.com/offensive-security/exploitdb/master/files_exploits.csv
INFO[06-25|05:28:03] Offensive Security Exploit               count=46825
INFO[06-25|05:28:03] Insert Exploit into go-exploitdb.        db=sqlite3
INFO[06-25|05:28:03] Inserting 46825 Exploits 
46825 / 46825 [-----------------------------------------------------------------------] 100.00% 7925 p/s
INFO[06-25|05:28:09] No CveID Exploit Count                   count=34187
INFO[06-25|05:28:09] CveID Exploit Count                      count=12638

// go-exploitdb checkout MaineK00n/fix-fetch-failed 
$ go-exploitdb fetch exploitdb
INFO[06-25|05:29:50] Fetching Offensive Security Exploit 
INFO[06-25|05:29:50] Fetching                                 URL=https://cve.mitre.org/data/downloads/allitems-cvrf.xml
INFO[06-25|05:30:21] Fetching                                 URL=https://raw.githubusercontent.com/offensive-security/exploitdb/master/files_shellcodes.csv
INFO[06-25|05:30:21] Fetching                                 URL=https://raw.githubusercontent.com/offensive-security/exploitdb/master/files_exploits.csv
INFO[06-25|05:30:22] Offensive Security Exploit               count=46825
INFO[06-25|05:30:22] Insert Exploit into go-exploitdb.        db=sqlite3
INFO[06-25|05:30:22] Inserting 46825 Exploits 
46825 / 46825 [------------------------------------------------------------------------] 100.00% 132 p/s
INFO[06-25|05:36:16] No CveID Exploit Count                   count=34187
INFO[06-25|05:36:16] CveID Exploit Count                      count=12638

Checklist:

You don't have to satisfy all of the following.

• Write tests
• Write documentation
• Check that there aren't other open pull requests for the same issue/feature
• Format your source code by make fmt
• Pass the test by make test
• Provide verification config / commands
• Enable "Allow edits from maintainers" for this PR
• Update the messages below

Is this ready for review?: YES

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