remove icon reference from project file

preview toy.csproj

@@ -54,7 +54,8 @@
     <Prefer32Bit>false</Prefer32Bit>
   </PropertyGroup>
   <PropertyGroup>
-    <ApplicationIcon>icon.ico</ApplicationIcon>
+    <ApplicationIcon>
+    </ApplicationIcon>
   </PropertyGroup>
   <PropertyGroup>
     <StartupObject>PreviewToy.Program</StartupObject>
@@ -172,9 +173,6 @@
       <Install>true</Install>
     </BootstrapperPackage>
   </ItemGroup>
-  <ItemGroup>
-    <Content Include="icon.ico" />
-  </ItemGroup>
   <Import Project="$(MSBuildBinPath)\Microsoft.CSharp.targets" />
   <!-- To modify your build process, add your task inside one of the targets below and uncomment it. 
        Other similar extension points exist, see Microsoft.Common.targets.