Revert "Guava.ListenableFuture" Version="9999.0.0""

This reverts commit ab518745cc.

templates/guava/Project.cshtml

@@ -114,7 +114,7 @@
   @if(Model.NuGetPackageId == "Xamarin.Google.Guava") {
   <ItemGroup>
     <!-- Reference a version of ListenableFuture that does not contain 'listenablefuture.jar' -->
-    <PackageReference Include="Xamarin.Google.Guava.ListenableFuture" Version="1.0.0.9" />
+    <PackageReference Include="Xamarin.Google.Guava.ListenableFuture" Version="9999.0.0" />
   </ItemGroup>
   }