cdr.c: Make turning on CDR debug a one step process instead of two.

Now "cdr set debug on" doesn't also require "core set verbose 1" to see
CDR debug output.
........

Merged revisions 424941 from http://svn.asterisk.org/svn/asterisk/branches/12


git-svn-id: http://svn.asterisk.org/svn/asterisk/branches/13@424942 f38db490-d61c-443f-a65b-d21fe96a405b