Removed redundant line from csproj which left after merge

#### Purpose

Removing redundant line from csproj which fails build.

#### Reviewers 

@Benglin, please take a look.
Did we just removed ```PackageManagerPublishView.xaml```? You might want to keep it so your change looks like this:

```xml
<Page Include="UI\Views\PackageManagerPublishView.xaml">
       <Generator>MSBuild:Compile</Generator>
       <SubType>Designer</SubType>
</Page>
```