for CFDs, when closing is complete, edit the URI to include the #section

[NovemLinguae]

Requqested by Fayenatic London in https://en.wikipedia.org/wiki/Wikipedia_talk:XFDcloser#RFC%3A_Priorities_for_XFDcloser_development_in_2022

"Update the URL in the browser's location bar to the current section, as would be the case if I had edited the section. This is so that I can copy the URL to paste into edit summaries when making manual changes. Currently, when using XFDcloser, the location bar URL does not get updated to the relevant section heading."

For CFDs to start. Could also do this for RFD/TFD/FFD/etc.