test: Don't enforce BIP94 on regtest unless specified by arg

The added regtest option -test=bip94 is only used in the functional
test for BIP94.
This is done because the default regtest consensus rules
should aim to follow to mainnet, not testnet.

src/chainparams.cpp

@@ -44,6 +44,7 @@ void ReadSigNetArgs(const ArgsManager& args, CChainParams::SigNetOptions& option
 void ReadRegTestArgs(const ArgsManager& args, CChainParams::RegTestOptions& options)
 {
     if (auto value = args.GetBoolArg("-fastprune")) options.fastprune = *value;
+    if (HasTestOption(args, "bip94")) options.enforce_bip94 = true;
 
     for (const std::string& arg : args.GetArgs("-testactivationheight")) {
         const auto found{arg.find('@')};