Qt4: make exit after play sticky (refs #9612)

modules/gui/qt4/input_manager.cpp

@@ -1165,11 +1165,12 @@ void MainInputManager::loopRepeatLoopStatus()
 void MainInputManager::activatePlayQuit( bool b_exit )
 {
     var_SetBool( THEPL, "play-and-exit", b_exit );
+    config_PutInt( p_intf, "play-and-exit", b_exit );
 }
 
 bool MainInputManager::getPlayExitState()
 {
-    return var_GetBool( THEPL, "play-and-exit" );
+    return var_InheritBool( THEPL, "play-and-exit" );
 }
 
 bool MainInputManager::hasEmptyPlaylist()