stylelint

[KristjanESPERANTO]

1. Update stylelint dependencies

• As of stylelint v15, we do not need stylelint-config-prettier anymore: https://github.com/prettier/stylelint-config-prettier/releases/tag/v9.0.5

2. Switch to stylelint-config-standard: stylelint-prettier/recommended has not been updated for a long time and still needs the old stylelint-config-prettier
3. Handle new stylelint issues

[codecov-commenter]

Codecov Report

Merging #3042 (785c6ac) into develop (fb22a76) will increase coverage by 0.07%.
The diff coverage is 0.00%.

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@@             Coverage Diff             @@
##           develop    #3042      +/-   ##
===========================================
+ Coverage    22.91%   22.99%   +0.07%     
===========================================
  Files           52       52              
  Lines        11543    11543              
===========================================
+ Hits          2645     2654       +9     
+ Misses        8898     8889       -9     

Impacted Files	Coverage Δ
modules/default/clock/clock.js	0.00% <0.00%> (ø)
modules/default/updatenotification/node_helper.js	90.27% <0.00%> (+12.50%)	⬆️

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