remove adding theme extension for "default" theme on startup

elm_theme does this automatically so there should never be a need for it

src/bin/e_main.c

@@ -461,8 +461,6 @@ main(int argc, char **argv)
         e_error_message_show(_("Enlightenment cannot initialize Elementary!\n"));
         _e_main_shutdown(-1);
      }
-   if (!eina_streq(elm_theme_get(NULL), "default"))
-     elm_theme_extension_add(NULL, "default");
    TS("Elementary Init Done");
    //_e_main_shutdown_push(elm_shutdown);