fix(sample): broken uwp nav-view

[Xiaoy312]

GitHub Issue (If applicable): closes #544

PR Type

What kind of change does this PR introduce?

• Bugfix

What is the current behavior?

nav-view item is stuck on compact mode while the nav-view is in full mode

What is the new behavior?

• updated the nav-view nav-view-item setup to be the same as in: NavigationView update Uno.Themes#864
• added icons to the nav-view items, since we can't hide the compact mode

PR Checklist

Please check if your PR fulfills the following requirements:

• Tested code with current supported SDKs
• Tested the changes where applicable:
  • UWP
  • WinUI
  • iOS
  • Android
  • WASM
  • MacOS
• Updated the documentation as needed:
  • General Doc Update
  • Controls Doc Update
  • Extensions Doc Update
  • controls-styles.md
  • lightweight-styling.md (LightWeight Styling Resource Keys)
• Runtime Tests and/or UI Tests for the changes have been added (for bug fixes / features) (if applicable)
• Contains NO breaking changes
• Associated with an issue (GitHub or internal)
• Commits must be following the Conventional Commits specification.

Other information

This was caused by NavView was somehow set to the "ListSizeFull" state, after the initialization.

[Xiaoy312]

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