app: Close all closable windows from quit()

Florian Müllner requested to merge wip/fmuellner/skip-taskbar-quit into master

There's no relation between a window being hidden from overview/taskbars and a window not being closable - currently we effectively disable the fallback quit action for any application with open transients, which simply doesn't make sense.

Instead, only exclude windows for which the close action has been explicitly disabled.

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