fix TDT of the TrigT1MuctpiPhase1 package ATR-26165
Closes ATR-26165
fix the initial value here (getMinThresholdNameAndValue
): https://gitlab.cern.ch/atlas/athena/-/blob/master/Trigger/TrigT1/TrigT1MuctpiPhase1/src/TrigThresholdDecisionTool.cxx#L211
as we are looking for the lowest threshold it should not be initialised with 0 ...