fix(calendar): prevent excessive fetching on client reload

- Only trigger `fetchCalendar()` when creating a new fetcher instance
- When reusing an existing fetcher, broadcast cached events without forcing a new fetch
- Prevents hitting rate limits (fix(calendar): prevent excessive fetching on client reload

Author: KristjanESPERANTO

modules/default/calendar/node_helper.js

@@ -70,13 +70,12 @@ module.exports = NodeHelper.create({
 			});
 
 			this.fetchers[identifier + url] = fetcher;
+			fetcher.fetchCalendar();
 		} else {
 			Log.log(`Use existing calendarfetcher for url: ${url}`);
 			fetcher = this.fetchers[identifier + url];
 			fetcher.broadcastEvents();
 		}
-
-		fetcher.fetchCalendar();
 	},
 
 	/**