fix(plugins/plugin-patternfly4-themes): improve contrast of active ta…

[starpit]

…b color

Fixes #4429

Description of what you did:

My PR is a:

• 💥 Breaking change
• 🐛 Bug fix
• 💅 Enhancement
• 🚀 New feature

Please confirm that your PR fulfills these requirements

• Multiple commits are squashed into one commit.
• The commit message follows Conventional Commits, which allows us to autogenerate release notes; e.g. fix(plugins/plugin-k8s): fixed annoying bugs
• All npm dependencies are pinned.

[codecov]

Codecov Report

Merging #4430 into master will decrease coverage by 0.08%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #4430      +/-   ##
==========================================
- Coverage   58.89%   58.81%   -0.09%     
==========================================
  Files          75       75              
  Lines        2411     2411              
  Branches      582      582              
==========================================
- Hits         1420     1418       -2     
- Misses        763      767       +4     
+ Partials      228      226       -2     

Impacted Files	Coverage Δ
packages/core/src/core/command-tree.ts	69.56% <0.00%> (-0.87%)	⬇️

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