Fix a few participants.tsv files

[yarikoptic]

A handy tool I discovered, to e.g. find all values which are not numeric

$ for f in */participants.tsv; do echo $f; mlr --itsv --otsv cut -f age $f; done

to just dump all the file names and their values for age if any

❯ mlr --itsv --otsv filter 'string($age) =~ "[^0-9]"' cut -f age ds000117/participants.tsv
participant_id	age	sex	first_ses
sub-emptyroom	n/a	n/a	n/a

to dump those which are not numeric in a particular file