[dev] Revised Patch to Admin Customer User search list

I submitted a patch that would supress the display of computer objects in the customer search list, but realized that the search list also displays group objects. So I revised the patch to exclude both computers and groups. This patch affects a different pm file (Kernel/System/CustomerUser/LDAP.pm), and handles both computers and groups. Please completely disregard the previous patch submitted. Thanks, Tyler Hepworth