[Glitch] Fix mark as read in notifications to be saved immediately

Port bec8b12bb5 to glitch-soc

Signed-off-by: Thibaut Girka <thib@sitedethib.com>

app/javascript/flavours/glitch/features/notifications/index.js

@@ -71,7 +71,7 @@ const mapDispatchToProps = dispatch => ({
   },
   onMarkAsRead() {
     dispatch(markNotificationsAsRead());
-    dispatch(submitMarkers());
+    dispatch(submitMarkers({ immediate: true }));
   },
   onMount() {
     dispatch(mountNotifications());