Remove Microsoft.Xaml.UI dependency because it causes issue in RN65

[namrog84]

Summary

RN65 causes issue with having multiple versions of WinUI (Microsoft.UI.Xaml) so everyone has to be on the same version for RNW65 (WinUI 2.6).
However RNLocalize doesn't actually use any functionality from Microsoft.UI.Xaml, so it can be removed and prevent further issues.

• What issues does the pull request solve? Please tag them so that they will get automatically closed once the PR is merged
  Make RNLocalize work more easily with RNW65

• What is the feature? (if applicable)
  Remove unused dependency.

• How did you implement the solution?
  Removed the dependency

Test Plan

What's required for testing (prerequisites)?

If it can still compile/link, then its not missing any compile time dependencies.

Checklist

• I have tested this on a device and a simulator
• I added the documentation in README.md
• I mentioned this change in CHANGELOG.md
• I updated the typed files (TS and Flow)
• I added a sample use of the API in the example project (example/App.js)

Tagging #170

[zoontek]

@namrog84 Thanks! I will publish a new version