Update fundraising link

Author: DrewLX

renderer/about.html

@@ -59,7 +59,7 @@ <h2>About Event Master Simulator Controller</h2>
   <script>
     $('a').click(function(e) {
       e.preventDefault();
-      require("electron").shell.openExternal("http://www.bbc.co.uk");
+      require("electron").shell.openExternal("https://www.justgiving.com/fundraising/e2-simulator");
       return false;
     });
   </script>