fix: Folder widget had outdated styling

[fsbraun]

Description

This PR updates the styling for the folder widget.

Related resources

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Checklist

• [x] I have opened this pull request against master
• [x] I have added or modified the tests when changing logic
• [x] I have followed the conventional commits guidelines to add meaningful information into the changelog
• [x] I have read the contribution guidelines and I have joined #workgroup-pr-review on Slack to find a “pr review buddy” who is going to review my pull request.

[codecov[bot]]

Codecov Report

Merging #1371 (92df3e3) into master (963a875) will increase coverage by 0.01%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #1371      +/-   ##
==========================================
+ Coverage   73.65%   73.66%   +0.01%     
==========================================
  Files          75       75              
  Lines        3408     3410       +2     
  Branches      551      551              
==========================================
+ Hits         2510     2512       +2     
  Misses        727      727              
  Partials      171      171              

Impacted Files	Coverage Δ
filer/fields/folder.py	41.37% <100.00%> (+1.37%)	:arrow_up: