demobrowser: Remove connection to non-existent signal

This amends commit 213fbe76

.

Change-Id: Ie5ca9f7713b0653e0e5241eb3e99644425a3b1e3
Reviewed-by: Allan Sandfeld Jensen <allan.jensen@qt.io>

examples/webenginewidgets/demobrowser/webview.cpp

@@ -349,8 +349,6 @@ void WebView::setPage(WebPage *_page)
     connect(page(), SIGNAL(statusBarMessage(QString)),
             SLOT(setStatusBarText(QString)));
 #endif
-    connect(page(), SIGNAL(loadingUrl(QUrl)),
-            this, SIGNAL(urlChanged(QUrl)));
     connect(page(), SIGNAL(iconChanged(QIcon)),
             this, SLOT(onIconChanged(QIcon)));
     connect(page(), &WebPage::featurePermissionRequested, this, &WebView::onFeaturePermissionRequested);