rename images to force cache bust

MediaBrowser.WebDashboard/MediaBrowser.WebDashboard.csproj

@@ -255,10 +255,10 @@
     <Content Include="dashboard-ui\css\images\userdata\thumbs_up_on.png">
       <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
     </Content>
-    <Content Include="dashboard-ui\css\images\userdata\unplayed.png">
+    <Content Include="dashboard-ui\css\images\userdata\playedoff.png">
       <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
     </Content>
-    <Content Include="dashboard-ui\css\images\userdata\played.png">
+    <Content Include="dashboard-ui\css\images\userdata\playedon.png">
       <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
     </Content>
     <Content Include="dashboard-ui\css\images\views\games.png">