Close event in Marker Database Browser dialog

[EugeneZelenko]

Hi, Matthias!

It'll be great if close button in dialog title would call accept method (in closeEvent), so both Close button in dialog and and title will send same signal that could be intercepted and processed.

It worked that way before in KLayout 0.28.12 / Qt 5.14.2 but stopped in KLayout 0.29.7 / Qt 6.7.3. Probably this is effect of Qt 6.

Currently I use event filter to translate close event to accept as workaround.