fix backend page loading after pushstate

app/views/admin/announcements/_index.html.erb

@@ -1,3 +1,7 @@
+<script>
+  if(document.querySelectorAll(".orbit-bar").length==0) location.reload();
+</script>
+
 <table class="table main-list">
   <thead>
     <tr class="sort-header">