config: Stop recommending Tor2web if in non anonymous mode
Because we don't allow client functionalities in non anonymous mode,
recommending Tor2web is a bad idea.
If a user wants to use Tor2web as a client (losing all anonymity), it should
run a second tor, not use it with a single onion service tor.
Fixes #21294.
Signed-off-by: David Goulet <dgoulet@torproject.org>