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

[GStreamer (GNOME Bugzilla)]

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

            Bug ID: 781789
           Summary: playback/player: qt: Use QApplication instead of
                    QGuiApplication
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-examples
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: dv at pseudoterminal.org
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

This avoids the following fatal error which happens with some Qt5 versions:

"QWidget: Cannot create a QWidget without QApplication"

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