Fix crash when trying to close database during unlock

[droidmonkey]

• Fix Crash when closing tab during password processing #7239 - prevent closing the database widget if the open dialog is still unlocking the database. This problem became slightly worse with quick unlock.

With this fix, if the user tries to close the database during unlock we will just ignore that request.

Testing strategy

Tested on Windows

Type of change

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

[codecov-commenter]

Codecov Report

Merging #8144 (9b92cc8) into develop (a2aac70) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff            @@
##           develop    #8144   +/-   ##
========================================
  Coverage    64.40%   64.40%           
========================================
  Files          339      339           
  Lines        43682    43685    +3     
========================================
+ Hits         28131    28134    +3     
  Misses       15551    15551           

Impacted Files	Coverage Δ
src/gui/DatabaseOpenWidget.cpp	56.65% <100.00%> (+0.38%)	⬆️
src/gui/DatabaseWidget.cpp	61.82% <100.00%> (ø)

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