libobs: Do not save hotkeys for private sources

libobs/obs-hotkey.c

@@ -206,7 +206,7 @@ obs_hotkey_id obs_hotkey_register_service(obs_service_t *service,
 obs_hotkey_id obs_hotkey_register_source(obs_source_t *source, const char *name,
 		const char *description, obs_hotkey_func func, void *data)
 {
-	if (!source || !lock())
+	if (!source || source->context.private || !lock())
 		return OBS_INVALID_HOTKEY_ID;
 
 	obs_hotkey_id id = obs_hotkey_register_internal(