message: Remove explicit check for -nodebug arg
  The InterpretNegativeSetting function is applied to all program options,
  and will turn -nodebug into -debug=0. Therefore, there is no need to
  explicitly check for -nodebug.
diff: @@ -662,7 +662,7 @@ bool AppInit2(boost::thread_group& threadGroup, CScheduler& scheduler)
  fDebug = !mapMultiArgs["-debug"].empty();
  // Special-case: if -debug=0/-nodebug is set, turn off debugging messages
  const vector<string>& categories = mapMultiArgs["-debug"];
  - if (GetBoolArg("-nodebug", false) || find(categories.begin(), categories.end(), string("0")) != categories.end())
  + if (find(categories.begin(), categories.end(), string("0")) != categories.end())
  fDebug = false;
  // Checkmempool and checkblockindex default to true in regtest mode
  