update admin app endpoint and ensure chatbox closes even if leaveRoom fails

dist/index.html

@@ -13,10 +13,8 @@
     <script src="./chatbox.js"></script>
     <script>
       var config = {
-        settingsEndpoint: 'https://safesupport-admin.herokuapp.com/api/get-settings',
         matrixServerUrl: 'https://matrix.safesupport.chat'
-      }
-
+      };
       EmbeddableChatbox.mount(config);
     </script>