Remove "My Newsletters" from shown profile

Hello,

I am using Simplenews in combination with the module Profiletab.

I would like to remove the "My Newsetters" from the Profile Menu. The tab "My Newsletters" only shall be shown if the user is editing his own profile.

line 528 right now is:

    case 'categories':
      if (user_access('subscribe to newsletters')) {
        $output[] = array('name' => 'newsletter', 'title' => t('My newsletters'), 'weight' => 10);
      }

How could I edit the code to prevent users ( profile user UID != Provile Visitor UID ) from seing this tab as long as the profile page is not being accessed by the real user ( profile user UID = Profile Visitor UID ) himself, or as long as the user is not editing his own profile.

Thanks for help!