Clean up some code inside interpreter.cpp #28879

Please describe the feature you'd like to see added.

The below code would run a bit faster.

                    // Drop the signature in pre-segwit scripts but not segwit scripts
                    if (sigversion == SigVersion::BASE) {
                        for (int k = 0; k < nSigsCount; k++)
                        {
                            valtype& vchSig = stacktop(-isig-k);
                            int found = FindAndDelete(scriptCode, CScript() << vchSig);
                            if (found > 0 && (flags & SCRIPT_VERIFY_CONST_SCRIPTCODE))
                                return set_error(serror, SCRIPT_ERR_SIG_FINDANDDELETE);
                        }
                    }```

### Is your feature related to a problem, if so please describe it.

No.

### Describe the solution you'd like

The below code would only  execute the FOR loop if the sigversion matches in the external IF statement 

                // Drop the signature in pre-segwit scripts but not segwit scripts
                if (sigversion == SigVersion::BASE) {
                    for (int k = 0; k < nSigsCount; k++)
                    {
                        valtype& vchSig = stacktop(-isig-k);
                        int found = FindAndDelete(scriptCode, CScript() << vchSig);
                        if (found > 0 && (flags & SCRIPT_VERIFY_CONST_SCRIPTCODE))
                            return set_error(serror, SCRIPT_ERR_SIG_FINDANDDELETE);
                    }
                }```

Describe any alternatives you've considered

None.

Please leave any additional context

This would speed up execution of code.

You'll have to provide benchmarks, if you claim that this speeds up something. Keep in mind that compilers can produce optimized executables, when passed optimization flags, without having to change any code at all.