Fix error handler which showed an error on reload, as the cancel event was triggered after the cacheInvalidated property has been set to true

src/browser/index.jsx

@@ -313,7 +313,7 @@ var MattermostView = React.createClass({
     webview.addEventListener('did-fail-load', function(e) {
       console.log(thisObj.props.name, 'webview did-fail-load', e);
       if (e.errorCode === -3 || // An operation was aborted (due to user action).
-        webview.cacheInvalidated) { //The operation was aborted to invalidate application cache
+        e.errorCode === -300) { //The operation was aborted to invalidate application cache
         return;
       }