SUSYTools: ensure that tau ID and tau trigger SFs are evaluated for signal taus

Hello,

This MR is ensuring that tau ID SFs and tau trigger SFs are evaluated for signal-quality taus, not baseline taus, as discussed in ATLSUSYBGF-620. It won't change the event-level total tau SF returned by the GetTotalTauSF function, which internally requires taus to pass signal quality + overlap removal. However, it will potentially change the "effscalefact" decoration on individual taus, which gets added inside GetSignalTauSF, where we currently require taus to pass the baseline selection.

Tagging @salderwe .

Cheers, Bertrand