cally: Fix translation to screen coordinates

Due to an accidental swap of an else statement and a preprocessor #else,
the output x coordinate is currently only set when not using the X11
windowing system, whoops.

https://bugzilla.gnome.org/show_bug.cgi?id=781902

clutter/clutter/cally/cally-actor.c

@@ -780,8 +780,8 @@ _cally_actor_get_top_level_origin (ClutterActor *actor,
         g_warning ("[x11] We were not able to get proper absolute "
                    "position of the stage");
     }
-  else
 #else
+  else
     {
       static gboolean yet_warned = FALSE;