Fix web UI not removing notifications after block (#10108)

Regression from #7311

app/javascript/mastodon/reducers/notifications.js

@@ -108,6 +108,7 @@ export default function notifications(state = initialState, action) {
   case NOTIFICATIONS_EXPAND_SUCCESS:
     return expandNormalizedNotifications(state, action.notifications, action.next);
   case ACCOUNT_BLOCK_SUCCESS:
+    return filterNotifications(state, action.relationship);
   case ACCOUNT_MUTE_SUCCESS:
     return action.relationship.muting_notifications ? filterNotifications(state, action.relationship) : state;
   case NOTIFICATIONS_CLEAR: