[#8529] rating style

[vellip]

Describe your changes Update rating button style and style for its different states depends on https://github.com/liqd/adhocracy4/pull/1694

Tasks

• [x] PR name contains story or task reference
• [ ] Steps to recreate and test the changes
• [ ] Documentation (docs and inline)
• [ ] Tests (including n+1 and django_assert_num_queries where applicable)
• [x] Changelog