[Bug 781789] playback/player: qt: Use QApplication instead of QGuiApplication

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=781789

--- Comment #1 from Carlos Rafael Giani <dv at pseudoterminal.org> ---
Created attachment 350500
  --> https://bugzilla.gnome.org/attachment.cgi?id=350500&action=edit
qt player qapplication fix

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