frames: Fall back to title bar if nothing else matched

The condition got removed in eeb2efe010 but that
had a side effect of adding a couple of rows of dead pixels so add it back.

https://bugzilla.gnome.org/show_bug.cgi?id=658069

src/ui/frames.c

@@ -2787,7 +2787,10 @@ get_control (MetaFrames *frames,
         return META_FRAME_CONTROL_RESIZE_E;
     }
 
+  if (y >= fgeom.borders.total.top)
     return META_FRAME_CONTROL_NONE;
+  else
+    return META_FRAME_CONTROL_TITLE;
 }
 
 void