Updating DotMatrix clock to use iOS SafeArea

[alexkblount]

Description of Change

Small change to update the dotmatrix clock sample to use safearea, ensuring the clock does not get lost under the notch in landscape mode.

Pull Request Checklist

• Rebased on top of master at time of the pull request.
• Changes adhere to coding standard in the sample.
• Consolidated NuGet packages across all projects in the sample (when changing existing package versions).
• Tested changes on the appropriate platforms (all platforms if changing the library code).