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Summary
We've received various issues regarding the text in the Ntlm dialog being invisible on certain Teams devices.
From some of my debugging, it seems that the dialog will inherit the styling of the host app. In an effort to help resolve these issues and to help keep the styling consistent, this PR creates and enforces a theme upon the Ntlm dialog that hardcodes the text to be black and the background of the dialog window to be white.
I verified that the dialog theme is consistent among three of our test apps, and loaded a site that invokes a test http auth request (https://www.httpwatch.com/httpgallery/authentication/) for testing.