fix border color discrepancy between themes

[lyubomir-popov]

Done

Muted borders are currently very faint, and the values aren't consistent between the light and dark theme. This pr makes them consistent (.2 opacity for default border contrast, .1 for muted)

[List of work items including drive-bys]

Fixes [list issues/bugs if needed]

QA

• Open demo
• [Add QA steps]
• Review updated documentation:
  • [List any updated documentation for review]

Check if PR is ready for release

If this PR contains Vanilla SCSS code changes, it should contain the following changes to make sure it's ready for the release:

• PR should have one of the following labels to automatically categorise it in release notes:
  • Feature 🎁, Breaking Change 💣, Bug 🐛, Documentation 📝, Maintenance 🔨.
• Vanilla version in package.json should be updated relative to the most recent release, following semver convention:
  • if CSS class names are not changed it can be bugfix relesase (x.x.X)
  • if CSS class names are changed/added/removed it should be minor version (x.X.0)
  • see the wiki for more details
• Any changes to component class names (new patterns, variants, removed or added features) should be listed on the what's new page.

Screenshots

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[webteam-app]

Demo

Jenkins

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