fix: Templatebound Margin to remove hardcoded margin (backport #715)

[mergify]

This is an automatic backport of pull request #715 done by Mergify.
Cherry-pick of df9e747 has failed:

On branch mergify/bp/release/stable/3.1/pr-715
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	both modified:   src/library/Uno.Toolkit.Material/Styles/Controls/v2/CardContentControl.xaml

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

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[jeromelaban]

@Mergifyio rebase

[mergify]

rebase

✅ Branch has been successfully rebased