[master] Update dependencies from dnceng/internal/dotnet-wpf-int (dotnet/core-setup...

[master] Update dependencies from dnceng/internal/dotnet-wpf-int (dotnet/core-setup#6916)

* Update dependencies from https://dev.azure.com/dnceng/internal/_git/dotnet-wpf-int build 20190624.38

- Microsoft.DotNet.Wpf.DncEng - 4.8.0-preview7.19324.38

Dependency coherency updates

- Microsoft.Private.Winforms - 4.8.0-preview7.19323.8 (parent: Microsoft.DotNet.Wpf.DncEng)
- Microsoft.DotNet.Wpf.GitHub - 4.8.0-preview7.19324.12 (parent: Microsoft.DotNet.Wpf.DncEng)

* rm PresentationUI.dll classification, match WPF

Commit migrated from https://github.com/dotnet/core-setup/commit/d70eb98f9a5cb9d964b82c846408e2fef9cd056f