fix: clean up spm mask generation
fix: clean up spm mask generation

mick-d/nipype,FCP-INDI/nipype,rameshvs/nipype,Leoniela/nipype,gerddie/nipype,Leoniela/nipype,fprados/nipype,wanderine/nipype,gerddie/nipype,JohnGriffiths/nipype,FCP-INDI/nipype,arokem/nipype,JohnGriffiths/nipype,mick-d/nipype_source,grlee77/nipype,wanderine/nipype,mick-d/nipype,carolFrohlich/nipype,rameshvs/nipype,wanderine/nipype,iglpdc/nipype,glatard/nipype,pearsonlab/nipype,sgiavasis/nipype,rameshvs/nipype,JohnGriffiths/nipype,fprados/nipype,arokem/nipype,grlee77/nipype,carolFrohlich/nipype,FredLoney/nipype,sgiavasis/nipype,gerddie/nipype,arokem/nipype,grlee77/nipype,blakedewey/nipype,sgiavasis/nipype,pearsonlab/nipype,sgiavasis/nipype,dgellis90/nipype,iglpdc/nipype,dmordom/nipype,FCP-INDI/nipype,dgellis90/nipype,Leoniela/nipype,carolFrohlich/nipype,carlohamalainen/nipype,FCP-INDI/nipype,glatard/nipype,iglpdc/nipype,dmordom/nipype,blakedewey/nipype,dmordom/nipype,carlohamalainen/nipype,dgellis90/nipype,gerddie/nipype,pearsonlab/nipype,mick-d/nipype,iglpdc/nipype,JohnGriffiths/nipype,grlee77/nipype,rameshvs/nipype,mick-d/nipype_source,mick-d/nipype,carolFrohlich/nipype,arokem/nipype,fprados/nipype,carlohamalainen/nipype,blakedewey/nipype,mick-d/nipype_source,FredLoney/nipype,blakedewey/nipype,glatard/nipype,pearsonlab/nipype,glatard/nipype,dgellis90/nipype,FredLoney/nipype,wanderine/nipype