Fix “ User warning: The following module is missing from the file system: theme/theme.”

Migrated issue

Reported by: drumm

Drupal 7.50 now checks for missing modules.

<?php
module_load_include('views', 'theme/theme', 'inc');
?>

in templates/api.theme.inc trips this up. The second argument is supposed to be the module name. I’m guessing it isn't actually loading anything and can be removed.