thaw evas on winlist activation with no clients available

fix T1667

src/modules/winlist/e_winlist.c

@@ -195,6 +195,7 @@ e_winlist_show(E_Zone *zone, E_Winlist_Filter filter)
    if (!_wins)
      {
         e_winlist_hide();
+        evas_event_thaw(zone->comp->evas);
         return 1;
      }