Remove macro to free locale

This functionality can now be handled automatically because locale can
now be freed seaparately from obs_module_unload with
obs_module_free_locale, which is called automatically when the module is
being freed.

plugins/mac-avcapture/plugin-main.c

@@ -10,8 +10,3 @@ bool obs_module_load(void)
 	obs_register_source(&av_capture_info);
 	return true;
 }
-
-void obs_module_unload(void)
-{
-	OBS_MODULE_FREE_DEFAULT_LOCALE();
-}