Sync up guess endpoint to match plutus game contract

[luigy]

Fixes issue reported on plutus IntersectMBO/plutus#3526 , but there may still be a change in behavior for awaiting on slots introduced by IntersectMBO/plutus#3342 that needs to be investigated further as the changes introduced didn't use to be required prior to it

[sorki]

Fixes the issue, thanks!

[sorki]

Now the Hydra reports test failure

    Expose 'lock' endpoint, but not 'guess' endpoint:  FAIL
      Test failed.
      Emulator log:
      [INFO] Slot 0: TxnValidate af5e6d25b5ecb26185289a03d50786b7ac4425b21849143ed7e18bcd70dc4db8
      [INFO] Slot 1: 00000000-0000-4000-8000-000000000000 {Contract instance for wallet 1}:
                       Contract instance started
      [INFO] Slot 1: 00000000-0000-4000-8000-000000000000 {Contract instance for wallet 1}:
                       Contract log: String "Waiting for lock endpoint..."
        src/Plutus/Contract/Test.hs:241:
        Expose 'lock' endpoint, but not 'guess' endpoint

but I guess :-) this is a correct behavior as both endpoints needs to be exposed to be able to call either of them.

[luigy]

Yes, the tests would have to be updated to match the new behavior :), but instead I'll just close this as there might be things that landed upstream that should take care of this