edje: Fix object leak with Efl.Part

A call to efl_reuse was missing.

src/lib/edje/edje_main.c

@@ -187,6 +187,7 @@ _edje_shutdown_core(void)
    _edje_message_shutdown();
    _edje_module_shutdown();
    _edje_external_shutdown();
+   _edje_internal_proxy_shutdown();
    _edje_box_shutdown();
    _edje_text_class_hash_free();
    _edje_size_class_hash_free();

src/lib/edje/edje_part_helper.h

@@ -59,6 +59,7 @@ type ## _del_cb(Eo *proxy) \
         efl_ref(proxy); \
         efl_parent_set(proxy, NULL); \
      } \
+   efl_reuse(proxy); \
    _ ## type ## _proxy = proxy; \
 } \
 \