tahoe: Disable app
The tahoe-lafs package is removed from Bullseye due to missing python3 support. The package may be reintroduced later.
I think the app can simply be disabled, because in Buster it was marked as Advanced, and not really usable anyway.
Closes: #1856 (closed).
Signed-off-by: James Valleroy jvalleroy@mailbox.org