TrigTauRec: invoke the correct execute function for TauVertexVariables
In TrigTauRec, we invoke TauVertexVariables::execute(xAOD::TauJet&), which actually does nothing. The correct one should be TauVertexVariables::executeVertexVariables(xAOD::TauJet&, xAOD::VertexContainer&). The bug is now fixed.
To avoid similar mistakes, make the default execute function return StatusCode::FAILURE.
Also avoid the use of member variables in MvaTESVariableDecorator, and change the threshold of several printouts.