Block to change url when isMainFrame is false.

using isMainFrame boolean in 'did-navigate-in-page' event.
[ref](electron/electron#6810)
need to more information about isMainFrame if when is set false.

when access `google.com`, google redirect `notification.google.com/...` page.
So It will occur isMainFrame === false in params of did-navigate-in-page.

app/renderer/pages/widget/components/WebWidget/index.jsx

@@ -70,7 +70,14 @@ class WebWidget extends React.Component {
       this.setState({ currentUrl: e.url });
     });
     webView.addEventListener('did-navigate-in-page', (e) => {
-      this.setState({ currentUrl: e.url });
+      /**
+       * when access `google.com`, google redirect `notification.google.com/...` page.
+       * So To block It.
+       * It will occur isMainFrame === false in params of did-navigate-in-page.
+       */
+      if (e.isMainFrame) {
+        this.setState({ currentUrl: e.url });
+      }
     });
     window.addEventListener('contextmenu', () => {
       widgetContextMenu(this.webViewRef.current);