Revert "op-program: Make directory preimage format the default." (#11823)

op-program/host/config/config.go

@@ -139,7 +139,7 @@ func NewConfig(
 		L2ClaimBlockNumber:  l2ClaimBlockNum,
 		L1RPCKind:           sources.RPCKindStandard,
 		IsCustomChainConfig: isCustomConfig,
-		DataFormat:          types.DataFormatDirectory,
+		DataFormat:          types.DataFormatFile,
 	}
 }
 

op-program/host/flags/flags.go

@@ -40,7 +40,7 @@ var (
 		Name:    "data.format",
 		Usage:   fmt.Sprintf("Format to use for preimage data storage. Available formats: %s", openum.EnumString(types.SupportedDataFormats)),
 		EnvVars: prefixEnvVars("DATA_FORMAT"),
-		Value:   string(types.DataFormatDirectory),
+		Value:   string(types.DataFormatFile),
 	}
 	L2NodeAddr = &cli.StringFlag{
 		Name:    "l2",