Clean up polymer paper item CSS variables

[silamon]

Breaking change

• Css theme vars removed:
  • --paper-item-icon-active-color
  • --paper-listbox-background-color

Proposed change

• Removals without replacements are dead code

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New feature (thank you!)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

Example configuration

Additional information

• This PR fixes or closes issue: fixes #
• This PR is related to issue or discussion:
• Link to documentation pull request:

Checklist

• The code change is tested and works locally.
• There is no commented out code in this PR.
• Tests have been added to verify that the new code works.

If user exposed functionality or configuration variables are added/changed:

• Documentation added/updated for www.home-assistant.io

[wendevlin]

Hey @silamon,
Can you update your branch and check if this PR is still needed?

It seems that I integrate this changes here:

• Add typography tokens #25084

[silamon]

Hey @silamon, Can you update your branch and check if this PR is still needed?

It seems that I integrate this changes here:

• Add typography tokens #25084

The remaining diff became much smaller, I would still merge for the removed code on 2 places, but I'm not sure if the defaults state color items are needed.

[wendevlin]

Good catch 👍

These are also used in the demo themes. Please remove it there too