message: RPC: Switch getblockfrompeer back to standard param name blockhash
  This commit partially reverts
  Github-Pull:
  Rebased-From:
diff: @@ -791,7 +791,7 @@ static RPCHelpMan getblockfrompeer()
  "Subsequent calls for the same block and a new peer will cause the response from the previous peer to be ignored.\n\n"
  "Returns an empty JSON object if the request was successfully scheduled.",
  {
  - {"block_hash", RPCArg::Type::STR_HEX, RPCArg::Optional::NO, "The block hash to try to fetch"},
  + {"blockhash", RPCArg::Type::STR_HEX, RPCArg::Optional::NO, "The block hash to try to fetch"},
  {"peer_id", RPCArg::Type::NUM, RPCArg::Optional::NO, "The peer to fetch it from (see getpeerinfo for peer IDs)"},
  },
  RPCResult{RPCResult::Type::OBJ, "", /*optional=*/false, "", {}},
  @@ -805,7 +805,7 @@ static RPCHelpMan getblockfrompeer()
  ChainstateManager& chainman = EnsureChainman(node);
  PeerManager& peerman = EnsurePeerman(node);
  - const uint256& block_hash{ParseHashV(request.params[0], "block_hash")};
  + const uint256& block_hash{ParseHashV(request.params[0], "blockhash")};
  const NodeId peer_id{request.params[1].get_int64()};
  const CBlockIndex* const index = WITH_LOCK(cs_main, return chainman.m_blockman.LookupBlockIndex(block_hash););
  