LiT integration: bake and use super macaroon

[guggero]

Depends on lightninglabs/lightning-terminal#278.

Currently LiT uses the UI password in the authData payload of the noise handshake because there is no single macaroon that can be used for all calls (to lnd/loop/pool/faraday).
With the possibility of baking and verifying a super macaroon in LiT we can instead use that super macaroon directly instead of the UI password that gets converted into the correct daemon specific macaroon on the LiT proxy side.

[ellemouton]

anything left to do for this issue @guggero ?

[guggero]

Nope, fixed by lightninglabs/lightning-terminal#319.