Fix bug in code for adjusting send times for day restrictions
Fix bug in code for adjusting send times for day restrictions

The code for enforcing day-of-week restrictions on message send times
had a bug in it which would sometimes cause a message to be moved to
the wrong day. This has been fixed.

jikamens/send-later,jikamens/send-later,jikamens/send-later,jikamens/send-later