Revert "core/types: add "chainID" field to legacy tx JSON encoding (ethereum#27452)"

This reverts commit 120956b.

Author: devopsbo3

core/types/transaction_marshalling.go

@@ -69,9 +69,6 @@ func (tx *Transaction) MarshalJSON() ([]byte, error) {
 		enc.V = (*hexutil.Big)(itx.V)
 		enc.R = (*hexutil.Big)(itx.R)
 		enc.S = (*hexutil.Big)(itx.S)
-		if tx.Protected() {
-			enc.ChainID = (*hexutil.Big)(tx.ChainId())
-		}
 
 	case *AccessListTx:
 		enc.ChainID = (*hexutil.Big)(itx.ChainID)