Add missing url param to ajax call
The url param was missing from the ajax call.
This bug happened because the url param was not set. jQuery defaults to location.href. BUT if the user came to the protected branches page from another page a previously set ajaxSettings.url was used as default url (which defaults to location.href) so when the user submitted the form the request was made to a completely wrong url. Refreshing the page was working because ajaxSettings.url was set to the current page'location.href and that was the correct URL.
This MR ensures the url will always be set with the right one.