gpg: Make --auto-upload also work for --edit-key

* g10/keyedit.c (keyedit_menu): Add an upload flag and set it as
needed.  On save upload to the keyserver.

That is the second of three parts to implement

Backported-from-master: f64a456271dd0b3e027386de30d734820c878978

• GnuPG-bug-id: T7333