Bug 30838: Don't fallback through phone numbers for sms

Bug 30838: Don't fallback through phone numbers for sms

This patch removes the fallback handling for smsalartnumber as the
to_address in notices. We ignore the to_address field in the message
queue at send time for sms anyway and use smsalertnumber exclusively so
having this field populated is just confusing to the end user

Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>