Backup of SQLite fail if there are Virtual Tables (e.g. FTS tables).

[xbello]

Type of PR (feature, enhancement, bug fix, etc.)

Bug fix

Description

Backup failed if the database included Virtual Tables (e.g. tables created for FTS).

Not sure if I should ammend line 36 instead (fix to CREATE VIRTUAL TABLE IF NOT EXISTS).

Related to #457, but I can't be sure #457 was also caused by virtual tables.

Why should this be added

App is currently broken for almost any Wagtail, as long as it includes "search" and is indexed.

Checklist

• [NOT NEEDED ] Documentation has been added or amended for this feature / update

[codecov]

Codecov Report

Merging #458 (73b4ff2) into master (d601574) will increase coverage by 0.22%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #458      +/-   ##
==========================================
+ Coverage   90.89%   91.12%   +0.22%     
==========================================
  Files          19       19              
  Lines         857      856       -1     
  Branches      171      171              
==========================================
+ Hits          779      780       +1     
+ Misses         42       41       -1     
+ Partials       36       35       -1     

Impacted Files	Coverage Δ
dbbackup/db/sqlite.py	92.72% <100.00%> (+3.44%)	⬆️

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