Allow input pattern validation for csv/tsv/txt

[ojziff]

Description of the bug

minor point, but why does --input have to match pattern ^\S+.txt$ Since the input is just a single column of SRR identifiers, it could be csv or tsv.

Command used and terminal output

nextflow run nf-core/fetchngs \
--input srr_id.txt \
--outdir reads \
--force_sratools_download -profile crick -r 1.7 -resume

Referring to:
see

fetchngs/nextflow_schema.json

Line 19 in b79cde2

"pattern": "^\\S+\\.txt$",

and

fetchngs/nextflow_schema.json

Line 21 in 0c43cc7

"pattern": "^\\S+\\.txt$",

[Midnighter]

I don't see a good reason. Was there one that I forgot about @drpatelh ?

[drpatelh]

Somewhat a duplicate of #111

[drpatelh]

Fixed in d67b3ef