fixing ipSigLeadTrk retrieval for offline taus for Run3 TauMonitoring

Antonio De Mariarequested to merge
fix_absipSigLeadTrk_offline into master

After this MR :

!36934 (merged)

by @martindl, update retrieving of "ipSigLeadTrk" variable for offline taus also for Run3 TauMonitoring. Same mechanism won't work for online taus since "d0SigTJVA" still not existing for HLT TauTrack and this will be investigated

pinging @malconad and @carquin

Edited by Antonio De Maria

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