fix: bound signal updates on the combobox

[thejackshelton]

What is it?

• Feature / enhancement
• Bug
• Docs / tests
• Other

Why is it needed?

Checklist:

• My code follows the developer guidelines of this project
• 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

[changeset-bot]

🦋 Changeset detected

Latest commit: aabfc7a

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@qwik-ui/headless	Patch

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[pkg-pr-new]

Open in Stackblitz

pnpm add https://pkg.pr.new/qwikifiers/qwik-ui@968

pnpm add https://pkg.pr.new/qwikifiers/qwik-ui/@qwik-ui/headless@968

pnpm add https://pkg.pr.new/qwikifiers/qwik-ui/@qwik-ui/styled@968

pnpm add https://pkg.pr.new/qwikifiers/qwik-ui/@qwik-ui/utils@968

commit: aabfc7a