[macOS Alias Tokens] Subtle Button in HC should keep it's border on hover and pressed states

[Saadnajmi]

Willing to submit a PR to fix?

• I am willing to submit a PR to fix

Requested priority

None

Products/applications affected

No response

Package version(s)

N/A

OS version(s)

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Platform

• iOS
• macOS
• win32
• windows
• android

Xcode version

No response

Please provide a reproduction of the bug

The closest analog to Subtle Button in native macOS are the titlebar buttons. in HC, they keep a consistent border around them. SubtleButton should too. To do this, subtleBackgroundHover and subtleBackgroundPressed need their high contrast variants updated to be closer to what transparentStroke does.

Actual behavior

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Expected behavior

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