"Open in browser" using URLs from your user instance

[mikaelvz]

When using the Open in browser option on a post or user profile, would it be possible to use the URL of the account instance you are currently using rather than the "source" URL?

This would make it easier to access options that are available on the web version but not yet implemented on the Android version like bookmark, edit, reply with "unlisted" and, in fact, all future development of the web app.

May be related to #402