update loading spinner

MediaBrowser.WebDashboard/MediaBrowser.WebDashboard.csproj

@@ -1841,9 +1841,6 @@
     <Content Include="dashboard-ui\thirdparty\require.js">
       <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
     </Content>
-    <Content Include="dashboard-ui\thirdparty\requirecss.js">
-      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
-    </Content>
     <Content Include="dashboard-ui\thirdparty\swipebox-master\css\swipebox.min.css">
       <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
     </Content>