Revert "Fix of #1640 teletext buttons appear too often"

This reverts commit d9a4e679f03be137a6dc60e9b82050d7bba8408a.

modules/gui/qt4/input_manager.cpp

@@ -465,6 +465,7 @@ void InputManager::telexToggle( bool b_enabled )
             }
         }
     }
+    emit teletextEnabled( b_enabled );
 }
 
 void InputManager::telexToggleButtons()