fix "open download" in demo browser

Open the downloaded file, not the directory.

Change-Id: I61b3a8e6788bf26b1a446459ce8b38774f8c28a0
Reviewed-by: Michal Klocek <[email protected]>
Reviewed-by: Peter Varga <[email protected]>

Author: jobor

examples/webenginewidgets/browser/downloadmanager.cpp

@@ -150,7 +150,7 @@ void DownloadWidget::stop()
 
 void DownloadWidget::open()
 {
-    QUrl url = QUrl::fromLocalFile(m_file.absolutePath());
+    QUrl url = QUrl::fromLocalFile(m_file.absoluteFilePath());
     QDesktopServices::openUrl(url);
 }