Remove folder from osu.Game.csproj

osu.Game/osu.Game.csproj

@@ -449,9 +449,6 @@
   <ItemGroup />
   <ItemGroup />
   <ItemGroup />
-  <ItemGroup>
-    <Folder Include="Online\Multiplayer\" />
-  </ItemGroup>
   <Import Project="$(MSBuildToolsPath)\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.
@@ -460,4 +457,4 @@
   <Target Name="AfterBuild">
   </Target>
   -->
-</Project>
+</Project>