Fix: Fix a issue that change always on top settings won't take effect immediately (#45994)

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## Summary of the Pull Request
Fix #45993

Always on top have a window proc thread that will reload the settings
once file watcher trigger a reload of settings.
And always on top has a worker thread to read the settings at the same
time.
So it may happen worker thread will read the stale setting, as a result,
user change settings, and try to invoke always on top, as if nothing has
changed.
As the issue's recording shows.

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## PR Checklist

- [X] Closes: #45993
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- [ ] **Communication:** I've discussed this with core contributors
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- [ ] **Tests:** Added/updated and all pass
- [ ] **Localization:** All end-user-facing strings can be localized
- [ ] **Dev docs:** Added/updated
- [ ] **New binaries:** Added on the required places
- [ ] [JSON for
signing](https://github.com/microsoft/PowerToys/blob/main/.pipelines/ESRPSigning_core.json)
for new binaries
- [ ] [WXS for
installer](https://github.com/microsoft/PowerToys/blob/main/installer/PowerToysSetup/Product.wxs)
for new binaries and localization folder
- [ ] [YML for CI
pipeline](https://github.com/microsoft/PowerToys/blob/main/.pipelines/ci/templates/build-powertoys-steps.yml)
for new test projects
- [ ] [YML for signed
pipeline](https://github.com/microsoft/PowerToys/blob/main/.pipelines/release.yml)
- [ ] **Documentation updated:** If checked, please file a pull request
on [our docs
repo](https://github.com/MicrosoftDocs/windows-uwp/tree/docs/hub/powertoys)
and link it here: #xxx

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## Detailed Description of the Pull Request / Additional comments

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## Validation Steps Performed

The setting take effect once it's changed:


https://github.com/user-attachments/assets/70d753e9-eca1-4040-9abf-4cfa4e8dacec