New OCDoctor toolbox script doesn't handle spaces in usernames

In our Ops Center environment we use a corporate provide LDAP service to provide the user accounts and the roles that they can perform.

However, the full username ends up being of the form:

user@ldap PROD

So, there's a space between ldap and PROD, (I don't control the LDAP user format) and when the new "clear_old_notifications.sh" script (part of OCDoctor 4.53) runs, it drops the "PROD" piece and therefore doesn't execute the deletes of the notifications for any of the listed users.

I can fix my edge case by making a change to the script, but a solution in the next version of OCDoctor would be ideal, for our company and maybe others.