[COOK-4721] Update cron.rb to work properly for SUSE

The recipe was unable to locate the template

ERROR: template[/etc/init.d/chef-client] (chef-client::cron line 44) had an error: Chef::Exceptions::FileNotFound: Cookbook 'chef-client' (3.5.0) does not contain a file at any of these locations:
  templates/suse-11.3//init.d/chef-client.erb
  templates/suse//init.d/chef-client.erb
  templates/default//init.d/chef-client.erb