remove unused code

MediaBrowser.WebDashboard/MediaBrowser.WebDashboard.csproj

@@ -173,9 +173,6 @@
     <Content Include="dashboard-ui\css\images\logo.png">
       <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
     </Content>
-    <Content Include="dashboard-ui\devices\windowsphone\wp.css">
-      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
-    </Content>
     <Content Include="dashboard-ui\home.html">
       <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
     </Content>