fix: ArgumentOutOfRangeException when adding PrimaryCommand to NavBar

[Kunal22shah]

GitHub Issue (If applicable): #1150

PR Type

What kind of change does this PR introduce?

• Bugfix

What is the current behavior?

What is the new behavior?

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

Internal Issue (If applicable):

[kazo0]

@Kunal22shah make sure to use the keyword closes or fixes before the link to the affected issue number:

If you change it to

closes #1150

Then the PR will be linked to the issue and it will auto-close the issue when this PR is merged

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