Core/Logging: Fixed filenames of backup logs

Closes #11765

src/server/shared/Logging/AppenderFile.cpp

@@ -81,6 +81,7 @@ FILE* AppenderFile::OpenFile(std::string const &filename, std::string const &mod
         std::string newName(fullName);
         newName.push_back('.');
         newName.append(LogMessage::getTimeStr(time(NULL)));
+        std::replace(newName.begin(), newName.end(), ':', '-');
         rename(fullName.c_str(), newName.c_str()); // no error handling... if we couldn't make a backup, just ignore
     }