Use the filtered value for the maximum spam comment age in the deletion note.

Now that the maximum age before a spam comment is deleted can be filtered by another plugin, make sure that we're using that filtered value when communicating to the user about how long it will be before comments are deleted out of the spam queue.


git-svn-id: https://plugins.svn.wordpress.org/akismet/trunk@1019842 b8457f37-d9ea-0310-8a92-e5e31aec5664