add: initialiseState on refresh

app/lib/pages/default_page.dart

 import 'dart:async';
 import 'package:app/server_requests/fetch_relation.dart';
+import 'package:app/server_requests/init_state.dart';
 import 'package:flutter/material.dart';
 import 'package:liquid_pull_to_refresh/liquid_pull_to_refresh.dart';
 
@@ -29,7 +30,7 @@ class _DefaultPageState extends State<DefaultPage> {
   }
 
   Future<void> _handleRefresh() async {
-    return await Future.delayed(const Duration(seconds: 2));
+    return await initialiseState();
   }
 
   @override