Fixes for new T1w processing
Fixes for new T1w processing

- Fix detection of pre-masked T1-weighted image in run_participant1() derived through use of fsl_anat or presence of "SkullStripped"=False in pre-processed data.
- Fix labelsgmfix call in run_participant2() to use same T1-weighted data as FreeSurfer.

BIDS-Apps/MRtrix3_connectome