getblockchaininfo RPC returns incorrect blocksigning script

[jamesdorfman]

The signblock_* fields in the getblockchaininfo RPC are caclculated in src/rpc/blockchain.cpp as follows:

CScript sign_block_script = chainparams.GetConsensus().signblockscript;
obj.pushKV("signblock_asm", ScriptToAsmStr(sign_block_script));
obj.pushKV("signblock_hex", HexStr(sign_block_script));

This is encoding the initial block signing script that the network was launched with at genesis.

However, this will become incorrect when the first dynafed transition which changes this script takes place.