Pipeline create - apply file permissions to new files

[ewels]

Get the file mode from the template file and apply it to the new file in nf-core create

Fixes #932

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 #944 (b28dcaf) into dev (e0f0d1b) will increase coverage by 0.02%.
The diff coverage is 100.00%.

❗ Current head b28dcaf differs from pull request most recent head 618179c. Consider uploading reports for the commit 618179c to get more accurate results

@@            Coverage Diff             @@
##              dev     #944      +/-   ##
==========================================
+ Coverage   69.61%   69.64%   +0.02%     
==========================================
  Files          34       34              
  Lines        4180     4184       +4     
==========================================
+ Hits         2910     2914       +4     
  Misses       1270     1270              

Impacted Files	Coverage Δ
nf_core/create.py	93.26% <100.00%> (+0.13%)	⬆️
nf_core/modules/create.py	60.91% <100.00%> (+0.45%)	⬆️

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[KevinMenden]

Nice 👌