Warn instead of fail if module is different from remote

[drpatelh]

Reverts #1357 because modules will be changed on PRs to nf-core/modules and hence always result in linting failures.

Couldn't see a CHANGELOG entry so just the 1 word to change. Nothing else to see here.

[GCJMackenzie]

looks good to me! Thanks for the quick fix :)

[codecov]

Codecov Report

Merging #1364 (a5dc3c8) into dev (5f8fad6) will not change coverage.
The diff coverage is 0.00%.

@@           Coverage Diff           @@
##              dev    #1364   +/-   ##
=======================================
  Coverage   67.01%   67.01%           
=======================================
  Files          50       50           
  Lines        5682     5682           
=======================================
  Hits         3808     3808           
  Misses       1874     1874           

Impacted Files	Coverage Δ
nf_core/modules/lint/module_changes.py	80.00% <0.00%> (ø)

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