Chore: Fixed fetching user logic for Joplin Cloud

packages/lib/utils/userFetcher.ts

@@ -25,7 +25,7 @@ const userFetcher = async () => {
 	const fileApi = await syncTarget.fileApi();
 	const api = fileApi.driver().api();
 
-	if (api.userId) {
+	if (!api.userId) {
 		// That can happen if we don't have a session yet or if it has been
 		// cleared
 		logger.info('Skipping fetching user because user ID is not available');