message: log, refactor: use guard clause in LogCategoriesList()
  and minor formatting fixups
diff: @@ -126,8 +126,7 @@ bool BCLog::Logger::DefaultShrinkDebugFile() const
  return m_categories == BCLog::NONE;
  }
  -struct CLogCategoryDesc
  -{
  +struct CLogCategoryDesc {
  BCLog::LogFlags flag;
  std::string category;
  };
  @@ -188,14 +187,12 @@ std::vector<LogCategory> BCLog::Logger::LogCategoriesList() const
  std::vector<LogCategory> ret;
  for (const CLogCategoryDesc& category_desc : categories) {
  - // Omit the special cases.
  - if (category_desc.flag != BCLog::NONE && category_desc.flag != BCLog::ALL) {
  + if (category_desc.flag == BCLog::NONE || category_desc.flag == BCLog::ALL) continue;
  LogCategory catActive;
  catActive.category = category_desc.category;
  catActive.active = WillLogCategory(category_desc.flag);
  ret.push_back(catActive);
  }
  - }
  return ret;
  }
  @@ -244,7 +241,7 @@ namespace BCLog {
  }
  return ret;
  }
  -}
  +} // namespace BCLog
  void BCLog::Logger::LogPrintStr(const std::string& str, const std::string& logging_function, const std::string& source_file, const int source_line)
  {
  