elm_conform: remove smart_callback when it is removed.

The owner of the smart_callbacks is window. so even if the conformant
is deleted, they aren't removed. It can make some problems.

@fix

legacy/elementary/src/lib/elm_conform.c

@@ -905,6 +905,11 @@ _elm_conformant_evas_object_smart_del(Eo *obj, Elm_Conformant_Data *sd)
 
    evas_object_data_set(sd->win, "\377 elm,conformant", NULL);
 
+   evas_object_smart_callback_del_full
+     (sd->win, "indicator,prop,changed", _on_indicator_mode_changed, obj);
+   evas_object_smart_callback_del_full
+     (sd->win, "rotation,changed", _on_rotation_changed, obj);
+
    eo_do_super(obj, MY_CLASS, evas_obj_smart_del());
 }