Increase MaxCodeSize to 65536 as in Celo L1

This keeps compatibility with the Celo L1, so that both core contracts
and third party contracts will be able to do fresh deploys after the L2
migration. If we want to go the Ethereum's value, it is better done
some time after the L2 migration to avoid having many breaking changes
at the same time.

params/protocol_params.go

@@ -135,7 +135,7 @@ const (
 	DefaultElasticityMultiplier     = 2          // Bounds the maximum gas limit an EIP-1559 block may have.
 	InitialBaseFee                  = 1000000000 // Initial base fee for EIP-1559 blocks.
 
-	MaxCodeSize     = 24576           // Maximum bytecode to permit for a contract
+	MaxCodeSize     = 65536           // Maximum bytecode to permit for a contract
 	MaxInitCodeSize = 2 * MaxCodeSize // Maximum initcode to permit in a creation transaction and create instructions
 
 	// Precompiled contract gas prices