fix: post to Telegram ChatOps channel option is not showing in the in…

…tegration page (#2498)

# What this PR does
Fix Post to Telegram ChatOps channel option is not showing in the
integration page.

Problem has been introduced by [this
PR](https://github.com/grafana/oncall/pull/2147/files)

## Which issue(s) this PR fixes
closes #2486

## Checklist

- [x] Unit, integration, and e2e (if applicable) tests updated
- [ ] Documentation added (or `pr:no public docs` PR label added if not
required)
- [x] `CHANGELOG.md` updated (or `pr:no changelog` PR label added if not
required)

---------

Co-authored-by: Rares Mardare <rares.mardare@grafana.com>

src/containers/IntegrationContainers/ExpandedIntegrationRouteDisplay/ExpandedIntegrationRouteDisplay.tsx

@@ -85,7 +85,7 @@ const ExpandedIntegrationRouteDisplay: React.FC<ExpandedIntegrationRouteDisplayP
 
     useEffect(() => {
       setIsLoading(true);
-      Promise.all([escalationChainStore.updateItems(), telegramChannelStore.updateItems()]).then(() =>
+      Promise.all([escalationChainStore.updateItems(), telegramChannelStore.updateTelegramChannels()]).then(() =>
         setIsLoading(false)
       );
     }, []);