edje: fix compatibility issue.

Obviously previous edje object file set would try reload file
even though the file is already loaded.

This brings different result if the file data has been modified or changed.

src/lib/edje/edje_smart.c

@@ -443,6 +443,7 @@ edje_object_mmap_set(Edje_Object *obj, const Eina_File *file, const char *group)
 EAPI Eina_Bool
 edje_object_file_set(Edje_Object *obj, const char *file, const char *group)
 {
+   efl_file_unload(obj);
    return efl_file_simple_load(obj, file, group);
 }