run prettier after dumping a json schema file

[mirpedrol]

Close #2115

PR checklist

• This comment contains a description of changes (with reason)
• CHANGELOG.md is updated
• If you've fixed a bug or added code that should be tested, add tests!
• Documentation in docs is updated

[codecov]

Codecov Report

Merging #2124 (6eb4664) into dev (e178898) will increase coverage by 0.08%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##              dev    #2124      +/-   ##
==========================================
+ Coverage   71.39%   71.47%   +0.08%     
==========================================
  Files          77       77              
  Lines        8358     8358              
==========================================
+ Hits         5967     5974       +7     
+ Misses       2391     2384       -7     

Impacted Files	Coverage Δ
nf_core/launch.py	63.26% <100.00%> (-0.10%)	⬇️
nf_core/lint_utils.py	80.76% <100.00%> (+2.04%)	⬆️
nf_core/modules/modules_json.py	80.53% <100.00%> (-0.12%)	⬇️
nf_core/schema.py	75.98% <100.00%> (-0.05%)	⬇️
nf_core/components/update.py	81.51% <0.00%> (ø)
nf_core/modules/test_yml_builder.py	52.00% <0.00%> (+0.88%)	⬆️
nf_core/modules/modules_differ.py	92.46% <0.00%> (+2.51%)	⬆️

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[ewels]

Maybe worth putting these into a helper function that takes an object and a filename and writes + runs prettier..?

Otherwise happy to merge 👍🏻