message: fix typo in linkdef
diff: #pragma link C++ class MLSelected+;
  #pragma link C++ class std::vector<RHypertriton3>+;
  #pragma link C++ class std::vector<SHypertriton3>+;
  -#pragma link C++ class std::vector<MLSelected3>+;
  +#pragma link C++ class std::vector<MLSelected>+;
  #pragma link C++ class REvent+;
  #endif
  