Do not block application shutdown with a QEventLoopLocker
1c4bf2f41a54
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Description

Do not block application shutdown with a QEventLoopLocker

This isn't necessary (anymore) and it prevents Kleopatra from shutting
down when quitOnLastWindowClosed is enabled (which we want to do for users
with elevated permissions on Windows).

Using a QEventLoopLocker and setting quitOnLastWindowClosed both prevent
the application from quitting when the last window is closed. For
Kleopatra it's sufficient to use the latter method.

(cherry picked from commit bfed041ea1b1524de14214ee70f73bc9b3e23a25)