Core/Logging: Set config options to behave like old log system.

src/server/shared/Logging/Appender.cpp

@@ -215,6 +215,8 @@ char const* Appender::getLogFilterTypeString(LogFilterType type)
             return "BATTLEFIELD";
         case LOG_FILTER_SERVER_LOADING:
             return "SERVER LOADING";
+        case LOG_FILTER_OPCODES:
+            return "OPCODE";
         default:
             break;
     }