Comment out MessageType
Comment out MessageType

As it is an unused enum, leaving it uncommented causes dead Protocol
Buffers code to be generated.

tendermint/tendermint,tendermint/tmsp,tendermint/tendermint,tendermint/tendermint,tendermint/tmsp,tendermint/tmsp,kidinamoto01/abci,tendermint/tendermint,kidinamoto01/abci,kidinamoto01/abci