Fix bug that did not allow for multiple batched RLS notifications to be sent.

A misunderstanding of how the scheduler worked caused further batched notifications
beyond the first not to get scheduled. Now we reset our scheduler ID to -1 after
the batched notification is sent. This way, further notifications can be scheduled
when they arise.


git-svn-id: http://svn.asterisk.org/svn/asterisk/branches/13@422239 f38db490-d61c-443f-a65b-d21fe96a405b