[Hosts] Workaround for context menu not opening

[davidegiacometti]

Summary of the Pull Request

Workaround for context menu not opening after selecting an entry. Repro here: https://github.com/microsoft/PowerToys/issues/21263#issuecomment-1279979507

Side-effect of the workaround is that FlyoutShowMode.Transient doesn't focus the opened flyout. Already addressed the issue: https://github.com/microsoft/microsoft-ui-xaml/issues/7838 Let's keep the issue opened.

PR Checklist

• [x] Closes: #21263
• [ ] Communication: I've discussed this with core contributors already. If work hasn't been agreed, this work might be rejected
• [ ] 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 for new binaries
  • [ ] WXS for installer for new binaries and localization folder
  • [ ] YML for CI pipeline for new test projects
  • [ ] YML for signed pipeline
• [ ] Documentation updated: If checked, please file a pull request on our docs repo and link it here: #xxx

Detailed Description of the Pull Request / Additional comments

Validation Steps Performed

Context menu is opening as expected

[crutkas]

/azp run

[azure-pipelines[bot]]

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