Changed openURL to no longer follow redirections

In case of special URL login methods this could lead to:

• you click on: https://foo.bar/XXX/-/merge_requests/40
• the browser opens with: https://foo.bar/users/sign_in

regardless if you are logged in with your browser or not.

This change makes it consistent to QDesktopServices::openUrl, which always opens the given URL.

NOTE: If you are not logged in with your browser, the browser will still redirect you.