fix(NavigationView): remove disabledlow brush usages (backport #1398)

[mergify[bot]]

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This is an automatic backport of pull request #1398 done by Mergify.

[mergify[bot]]

Cherry-pick of 535b19e1205bc1dbb45128d11b6a03340a3f3024 has failed:

On branch mergify/bp/release/stable/5.0/pr-1398
Your branch is up to date with 'origin/release/stable/5.0'.

You are currently cherry-picking commit 535b19e1.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Unmerged paths:
  (use "git add <file>..." to mark resolution)
    both modified:   doc/styles/NavigationView.md
    both modified:   src/library/Uno.Material/Styles/Controls/v2/NavigationView.xaml

no changes added to commit (use "git add" and/or "git commit -a")

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

[agneszitte]

fyi @kazo0 cherry-pick failed

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