message: log: remove deprecated `db` log category
diff: @@ -95,15 +95,7 @@ void BCLog::Logger::EnableCategory(BCLog::LogFlags flag)
  bool BCLog::Logger::EnableCategory(const std::string& str)
  {
  BCLog::LogFlags flag;
  - if (!GetLogCategory(flag, str)) {
  - if (str == "db") {
  - // DEPRECATION: Added in 0.20, should start returning an error in 0.21
  - LogPrintf("Warning: logging category 'db' is deprecated, use 'walletdb' instead\n");
  - EnableCategory(BCLog::WALLETDB);
  - return true;
  - }
  - return false;
  - }
  + if (!GetLogCategory(flag, str)) return false;
  EnableCategory(flag);
  return true;
  }
  