Remove CommigSig.Absent helper

Signed-off-by: Thane Thomson <connect@thanethomson.com>

internal/consensus/state.go

@@ -2022,7 +2022,7 @@ func (cs *State) RecordMetrics(height int64, block *types.Block) {
 
 		for i, val := range cs.LastValidators.Validators {
 			commitSig := block.LastCommit.Signatures[i]
-			if commitSig.Absent() {
+			if commitSig.BlockIDFlag == types.BlockIDFlagAbsent {
 				missingValidators++
 				missingValidatorsPower += val.VotingPower
 			}

internal/state/execution.go

@@ -404,7 +404,7 @@ func buildLastCommitInfo(block *types.Block, store Store, initialHeight int64) a
 		commitSig := block.LastCommit.Signatures[i]
 		votes[i] = abci.VoteInfo{
 			Validator:       types.TM2PB.Validator(val),
-			SignedLastBlock: !commitSig.Absent(),
+			SignedLastBlock: commitSig.BlockIDFlag != types.BlockIDFlagAbsent,
 		}
 	}