removed dead code

MediaBrowser.WebDashboard/MediaBrowser.WebDashboard.csproj

@@ -800,9 +800,6 @@
     <Content Include="dashboard-ui\css\librarybrowser.css">
       <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
     </Content>
-    <Content Include="dashboard-ui\css\tileitem.css">
-      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
-    </Content>
     <Content Include="dashboard-ui\edititemmetadata.html">
       <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
     </Content>