Update mutt-wizard.muttrc

Added a threads flag to have email appear as threads. 
The only things I didn't add was a the capability of adding sent mail to the threads. I'm unsure of the best way to solve that issue.

share/mutt-wizard.muttrc

@@ -9,6 +9,7 @@ set mime_type_query_command = "file --mime-type -b %s"
 set date_format="%y/%m/%d %I:%M%p"
 set index_format="%2C %Z %?X?A& ? %D %-15.15F %s (%-4.4c)"
 set sort = 'reverse-date'
+set sort = threads
 set smtp_authenticators = 'gssapi:login'
 set query_command = "abook --mutt-query '%s'"
 set rfc2047_parameters = yes