[sync][stream] remove writeCommitSig in both legacy sync and downloader

api/service/legacysync/syncing.go

@@ -859,11 +859,6 @@ func (ss *StateSync) UpdateBlockAndStatus(block *types.Block, bc *core.BlockChai
 		Uint32("ShardID", block.ShardID()).
 		Msg("[SYNC] UpdateBlockAndStatus: New Block Added to Blockchain")
 
-	if verifyAllSig && haveCurrentSig {
-		if err := bc.WriteCommitSig(block.NumberU64(), block.GetCurrentCommitSig()); err != nil {
-			return err
-		}
-	}
 	for i, tx := range block.StakingTransactions() {
 		utils.Logger().Info().
 			Msgf(

hmy/downloader/downloader.go

@@ -312,5 +312,5 @@ func verifyAndInsertBlock(bc blockChain, block *types.Block, nextBlocks ...*type
 	if _, err := bc.InsertChain(types.Blocks{block}, false); err != nil {
 		return errors.Wrap(err, "[InsertChain]")
 	}
-	return bc.WriteCommitSig(block.NumberU64(), block.GetCurrentCommitSig())
+	return nil
 }