Accept kdbx:// urls in Edit Entry view

[varjolintu]

Fix displying URLs starting with kdbx:// as invalid.

Fixes #7220.

Testing strategy

Manually.

Type of change

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

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 64.33%. Comparing base (cd642e7) to head (0ec9503).
Report is 541 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #7221      +/-   ##
===========================================
+ Coverage    64.30%   64.33%   +0.03%     
===========================================
  Files          337      337              
  Lines        42447    42448       +1     
===========================================
+ Hits         27295    27307      +12     
+ Misses       15152    15141      -11     

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