Qt: hide the resume panel when the vout is released

(cherry picked from commit 0a9e3479a69f17734dfe66ee1117839d667c95d8)
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

modules/gui/qt4/main_interface.cpp

@@ -761,6 +761,7 @@ void MainInterface::releaseVideoSlot( void )
     videoWidget->release();
     setVideoOnTop( false );
     setVideoFullScreen( false );
+    hideContinueDialog();
 
     if( stackCentralW->currentWidget() == videoWidget )
         restoreStackOldWidget();