Make sure fullscreen does not work for in_nograb when manually Alt-Entering, too.

code/client/cl_keys.c

@@ -1164,7 +1164,7 @@ void CL_KeyEvent (int key, qboolean down, unsigned time) {
 		{
 			if (keys[K_ALT].down)
 			{
-				Key_ClearStates();
+//				Key_ClearStates();  // Thilo: why should we clear the key states here?
 				Cvar_SetValue( "r_fullscreen",
 						!Cvar_VariableIntegerValue( "r_fullscreen" ) );
 				return;