Windowscommunitytoolkit: ImageEx.CornerRadius property not working anymore

[Sergio0694]

Describe the bug

The ImageEx.CornerRadius property is no longer working.
Setting that doesn't change how the image is displayed - no matter its value the image is always just a square.

• [X] Is this bug a regression in the toolkit? If so, what toolkit version did you last see it work: 6.1.1

Steps to Reproduce

• [X] Can this be reproduced in the Sample App?

Steps to reproduce the behavior:

1. Clone master
2. Build and run the sample app
3. Go to the ImageEx sample page
4. Notice how the image with a custom CornerRadius value are still rendered as quares

Expected behavior

Modifying CornerRadius should apply to the displayed image.

Screenshots

Environment

NuGet Package(s): 

Package Version(s): 

Windows 10 Build Number:
- [ ] Fall Creators Update (16299)
- [ ] April 2018 Update (17134)
- [ ] October 2018 Update (17763)
- [ ] May 2019 Update (18362)
- [X] May 2020 Update (19041)
- [ ] Insider Build (build number: )

App min and target version:
- [ ] Fall Creators Update (16299)
- [ ] April 2018 Update (17134)
- [ ] October 2018 Update (17763)
- [X] May 2019 Update (18362)
- [ ] May 2020 Update (19041)
- [ ] Insider Build (xxxxx)

Device form factor:
- [X] Desktop
- [ ] Xbox
- [ ] Surface Hub
- [ ] IoT

Visual Studio 
- [ ] 2017 (version: )
- [X] 2019 (version: 16.7) 
- [ ] 2019 Preview (version: )

[michael-hawker]

Nice catch, thanks @Sergio0694!

Were there any other controls we were doing this on? (I'm guessing not, but could be good to check for new properties we've overridden).

[Sergio0694]

@Sergio0694 Did a solution-wise search and didn't find anything, so I think we should be good 😄