update confounds to use explicit path to ApplyXFM
update confounds to use explicit path to ApplyXFM

shoshber/fmriprep,shoshber/fmriprep,chrisfilo/fmriprep,oesteban/fmriprep,poldracklab/fmriprep,oesteban/preprocessing-workflow,oesteban/fmriprep,poldracklab/fmriprep,oesteban/preprocessing-workflow,poldracklab/fmriprep,poldracklab/preprocessing-workflow,oesteban/fmriprep,poldracklab/preprocessing-workflow