Move active/hover button opacity variables to settings

[bartaz]

Done

Moved active and hover button background variables to colour settings (where they are needed), so that button pattern file does not need to be imported for settings to work.

QA

• Just make sure CI is good (all builds and tests pass)

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

[webteam-app]

Demo starting at https://vanilla-framework-5029.demos.haus

[minkyngkm]

LGTM