Fixed ImageEx.CornerRadius property

[Sergio0694]

Fixes #3528

PR Type

What kind of change does this PR introduce?

• Bugfix

What is the current behavior?

The ImageEx.CornerRadius property isn't working anymore.

What is the new behavior?

Modifying ImageEx.CornerRadius works correctly.

Additional detail

With #3440, we bumped the minimum SDK to 1809 (build 17763), which is the first one with the CornerRadius being available in the Control class. I suspect building the controls package with that minimum SDK caused an issue with ImageEx defining the CornerRadius property again (using new), so that the XAML TemplateBinding ended up failing to find the correct property to bind to. It might also be because setting the property in XAML ended up setting the value for the incorrect duplicate one, so that binding was never update. Regardless, with that minimum version available there's no reason to duplicate that property in the first place, we can just use the built-in one and bind to that. This PR removes that duplicate property, fixing the issue.

NOTE: this is technically a breaking change as we're removing a public property, but users should effectively not really notice any difference, unless they were for some reason setting that very specific property through reflection, which is highly unlikely. Adding the tag for correctness, since this is still in fact a breaking change. Not likely to be noticed though 😄

PR Checklist

Please check if your PR fulfills the following requirements:

• Tested code with current supported SDKs
• Pull Request has been submitted to the documentation repository instructions. Link:
• Sample in sample app has been added / updated (for bug fixes / features)
  • Icon has been created (if new sample) following the Thumbnail Style Guide and templates
• Tests for the changes have been added (for bug fixes / features) (if applicable)
• Header has been added to all new source files (run build/UpdateHeaders.bat)
• Contains NO breaking changes

[ghost]

Thanks Sergio0694 for opening a Pull Request! The reviewers will test the PR and highlight if there is any conflict or changes required. If the PR is approved we will proceed to merge the pull request 🙌

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