Fix headless toggle-group class

[zaynet]

What is it?

• [ ] Feature / enhancement
• [x] Bug
• [ ] Docs / tests
• [ ] Other

Why is it needed?

Checklist:

• [x] My code follows the developer guidelines of this project
• [x] I have performed a self-review of my own code
• [ ] I have ran pnpm change and documented my changes
• [ ] I have add necessary docs (if needed)
• [ ] Added new tests to cover the fix / functionality

[pkg-pr-new[bot]]

Open in Stackblitz

pnpm add https://pkg.pr.new/qwikifiers/qwik-ui@1017

pnpm add https://pkg.pr.new/qwikifiers/qwik-ui/@qwik-ui/styled@1017

pnpm add https://pkg.pr.new/qwikifiers/qwik-ui/@qwik-ui/headless@1017

pnpm add https://pkg.pr.new/qwikifiers/qwik-ui/@qwik-ui/utils@1017

commit: af3f0b7