update multiselect

MediaBrowser.WebDashboard/MediaBrowser.WebDashboard.csproj

@@ -104,6 +104,9 @@
     <Content Include="dashboard-ui\components\apphost.js">
       <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
     </Content>
+    <Content Include="dashboard-ui\components\categorysyncbuttons.js">
+      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+    </Content>
     <Content Include="dashboard-ui\components\channelmapper\channelmapper.js">
       <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
     </Content>