Fix Segfault von Ctrl-Q

Merged Philipp Gortan requested to merge mephinet/pavucontrol:fix-segfault-on-ctrl-q into master

Calling Gtk::Main::quit from an application with an active window causes a segfault. To reproduce, open pavucontrol and press Ctrl-Q.

Fixed by closing the window instead.

cf https://stackoverflow.com/questions/50342151/what-is-the-difference-between-gtkmain-and-gtkapplicationcreate

Fixes #93 (closed)

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