Switching FTF to always use FTFPass flags

Switching FTF to always use one set of flags, so that FTF performance isn't affected by the setting of the offline flag doFastTracking. Furthermore, in the future we can continue to optimise FTF performance through the use of FTFPass flags - a set of flags for FTF that are best for FTF.

However, this will impact and introduce performance changes to the ART tests using FTF. These are test_run4_ttbar_PU200_FTF and test_run4_mu100_FTF (once the bugfix to the single muon test is implemented via !60874 (merged)). The ART test shifters will be notified of the expected changes.