Remove intellisense files for Ribbons (not needed for the sample)

Author: augustoproiete

sample/SampleAddIn/SampleAddIn.csproj

@@ -58,12 +58,6 @@
     <None Include="App.config">
       <SubType>Designer</SubType>
     </None>
-    <None Include="customUI.xsd">
-      <SubType>Designer</SubType>
-    </None>
-    <None Include="customui14.xsd">
-      <SubType>Designer</SubType>
-    </None>
     <None Include="ExcelDna.DnaLibrary.xsd">
       <SubType>Designer</SubType>
     </None>