chore: downgrade to tendermint v0.34.x (#12958)

simapp/simd/cmd/testnet.go

@@ -15,8 +15,8 @@ import (
 	tmconfig "github.com/tendermint/tendermint/config"
 	tmos "github.com/tendermint/tendermint/libs/os"
 	tmrand "github.com/tendermint/tendermint/libs/rand"
-	tmtime "github.com/tendermint/tendermint/libs/time"
 	"github.com/tendermint/tendermint/types"
+	tmtime "github.com/tendermint/tendermint/types/time"
 
 	"github.com/cosmos/cosmos-sdk/client"
 	"github.com/cosmos/cosmos-sdk/client/flags"
@@ -229,7 +229,6 @@ func initTestnetFiles(
 		nodeConfig.SetRoot(nodeDir)
 		nodeConfig.Moniker = nodeDirName
 		nodeConfig.RPC.ListenAddress = "tcp://0.0.0.0:26657"
-		nodeConfig.Mode = tmconfig.ModeValidator
 
 		if err := os.MkdirAll(filepath.Join(nodeDir, "config"), nodeDirPerm); err != nil {
 			_ = os.RemoveAll(args.outputDir)