Flipped default Settings Card Action Icon in RTL contexts

[Avid29]

Fixes #846

PR Type

What kind of change does this PR introduce?

Bugfix

What is the current behavior?

The default ActionIcon is a chevron that points right, regardless of the FlowDirection

What is the new behavior?

The default ActionIcon is a chevron that points outwards, flipping based on the FlowDirection

PR Checklist

Please check if your PR fulfills the following requirements:

• Created a feature/dev branch in your fork (vs. submitting directly from a commit on main)
• Based off latest main branch of toolkit
• Tested code with current supported SDKs(https://github.com/CommunityToolkit/WindowsCommunityToolkit-design-assets)
• Contains NO breaking changes

Other information

I'm not terribly happy with this solution. I think this poor solution represents an issue that the action icon maybe should be templated.

[niels9001]

@Avid29 ActionIcon can be changed by the developer to pretty much any ic9n. I eonder if in some, or most uses cases, you do not want that icon to be flipped.

Is there an event where we detect RTL and we check if the default glyph is set and if so we set the RTL version of the glyph instead? If not we leave it alone?

[Avid29]

@niels9001 This PR only flips the default icon.

It works because the ActionIcon is implemented as an IconElement, and I changed it to initialize as a FontIcon using the same chevron, but with MirroredWhenRightToLeft as true