[Glitch] Fix notification polling showing a loading bar in web UI

Port e856838e0c to glitch-soc

Signed-off-by: Claire <claire.github-309c@sitedethib.com>

app/javascript/flavours/glitch/actions/notification_groups.ts

@@ -141,6 +141,9 @@ export const pollRecentNotifications = createDataLoadingThunk(
 
     return { notifications };
   },
+  {
+    useLoadingBar: false,
+  },
 );
 
 export const processNewNotificationForGroups = createAppAsyncThunk(