User can go back to the form

[boyska]

I tried to solve #4017. The easiest way I could find was to just add a new format.

That's the UX:

• user has somehow got a link for a bridge. They might have just created it, or got the link from a friend. Say: http://localhost:8484/?action=display&bridge=FilterBridge&url=https%3A%2F%2Fanchor.fm%2Fs%2Fea123456%2Fpodcast%2Frss&filter=a&filter_type=permit&target_author=on&target_title=on&length_limit=54&format=Html
• the format list includes a "Form" button. Click on it!
• it now shows a form:

As for the implementation, i wanted to avoid repeating the code to generate the form, so I extended BridgeCard a fair bit, so that it now allows parameters to be set from the request. This required changing the prototype of many methods!

[dvikan]

thanks for the pr!

in my humble opinion, this is too much code, too many changes and too much increased complexity for this feature.