Fixed image path (.png not .jpg)

Microsoft.Windows.Toolkit.SampleApp/Microsoft.Windows.Toolkit.SampleApp.csproj

@@ -208,7 +208,7 @@
     <Content Include="SamplePages\BlurBehavior\blurBehavior.gif" />
     <Content Include="SamplePages\Carousel\icon.jpg" />
     <Content Include="SamplePages\Carousel\CarouselCode.bind" />
-    <Content Include="SamplePages\RotatorTile\icon.jpg" />
+    <Content Include="SamplePages\RotatorTile\icon.png" />
     <Content Include="SamplePages\LiveTile\icon.jpg" />
     <Content Include="SamplePages\Toast\icon.jpg" />
     <Content Include="SamplePages\Twitter Service\TwitterCode.bind" />
@@ -699,4 +699,4 @@
   <Target Name="AfterBuild">
   </Target>
   -->
-</Project>
+</Project>