Remove method from grin-wallet.yml and keybase.rs from adapters

[s7500]

This PR solves part of the issue
Doesn't break consensus
No additional unit tests needed
All tests passed

[phyro]

Thanks for the contribution @s7500 . I'll take a look into it a bit more later when I get to my PC. One thing that comes to mind is that removing keybase adapter would also require removing keybase_notify_ttl config option.

[s7500]

Thanks @phyro, that's a good note!
I also removed it in the new commit

[phyro]

Note that there are still some keybase_notify_ttl occurrences left in the codebase

[s7500]

Sorry, my mistake
I should trust my ide less

[yeastplume]

Looks good, thanks for this. I remember it being annoying having to maintain that unused keybase adapter, so happy to have it removed from the code.