PresentationWidget: Fix screen switching at runtime
Screen switching from inside presentation mode currently does not work correctly. The reason is that the widget geometry() shall be moved *while* the widget is configured as fullscreen. This patch temporarily disables fullscreen, so the screen can be switched. You can check it with release 20.04: Screen switching from within presentation mode will not work. Set the widget to windowed (e. g. Alt+F3 or right-click in task manager), screen switching will work now. !233 shall port PresentationWidget to QScreen in release 20.12, so this is just a compact workaround without much intelligence. The drawback is that custom window rules might get confused when the screen geometry changes for some reasons.
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