Fix color scheme active passive residues

[VGPReys]

This PR fixes the color scheme used for active and passive residues selection / displays, to match the usual one used in HADDOCK2.X webserver.

• Active residues are now in red
• Passive residues are now in green

[codecov]

Codecov Report

❌ Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 26.47%. Comparing base (cfd87ed) to head (e9c5879).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
src/molviewer.tsx	0.00%	0 Missing and 2 partials ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #11   +/-   ##
=======================================
  Coverage   26.47%   26.47%           
=======================================
  Files          16       16           
  Lines         389      389           
  Branches       87       87           
=======================================
  Hits          103      103           
  Misses        204      204           
  Partials       82       82           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.

[rvhonorato]

since it has net change o 0 the patch coverage should not trigger - good to merge as is