Merge branch 'clear-all-controls' into 'master'

Clear P3 and P4 controls too when clearing all controls

See merge request KartKrew/Kart-Public!117

src/g_input.c

@@ -1239,6 +1239,8 @@ void G_ClearAllControlKeys(void)
 	{
 		G_ClearControlKeys(gamecontrol, i);
 		G_ClearControlKeys(gamecontrolbis, i);
+		G_ClearControlKeys(gamecontrol3, i);
+		G_ClearControlKeys(gamecontrol4, i);
 	}
 }