Default make_css to web/cobrands rather than web.

[dracos]

This would fix an issue where if you have, say, a multi-gigabyte photo cache at web/photos, it won't get searched for SCSS files.

[codecov]

Codecov Report

Merging #3712 (79336e2) into master (9810f60) will increase coverage by 2.43%.
The diff coverage is n/a.

❗ Current head 79336e2 differs from pull request most recent head 0ae8d2f. Consider uploading reports for the commit 0ae8d2f to get more accurate results

@@            Coverage Diff             @@
##           master    #3712      +/-   ##
==========================================
+ Coverage   82.65%   85.09%   +2.43%     
==========================================
  Files         348      294      -54     
  Lines       23821    19343    -4478     
  Branches     3622     3622              
==========================================
- Hits        19689    16459    -3230     
+ Misses       2991     1744    -1247     
+ Partials     1141     1140       -1     

Impacted Files	Coverage Δ
web/cobrands/bathnes/staff.js
web/js/duplicates.js
web/cobrands/buckinghamshire/assets.js
web/cobrands/bromley/a-z-nav.js
web/cobrands/westminster/assets.js
web/cobrands/bromley/assets.js
web/cobrands/fixmystreet/admin.js
web/cobrands/isleofwight/assets.js
web/js/front.js
web/cobrands/fixmystreet.com/front.js
... and 46 more

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[chrismytton]

🎨