app_voicemail: use a consistent generator string

When updating voicemail.conf when a user changes
their pin, change the generator string to be the
same as the module name when reading so that the
same config_hook will be called.

Review: https://reviewboard.asterisk.org/r/3837/
........

Merged revisions 419284 from http://svn.asterisk.org/svn/asterisk/branches/11


git-svn-id: http://svn.asterisk.org/svn/asterisk/branches/12@419285 f38db490-d61c-443f-a65b-d21fe96a405b