apps/app_dial: Set the DIALSTATUS to NOANSWER on privacy option 5

apps/app_dial: Set the DIALSTATUS to NOANSWER on privacy option 5

If the callee selects option '5' using the Dial application's privacy
(P) option, the DIALSTATUS is erroneously set to ANSWER. This option
reflects the callee sending the caller to VoiceMail one time; the call
is definitely *not* ANSWERed in such a scenario. With this patch, the
DIALSTATUS is instead set to NOANSWER, which is the same DIALSTATUS that
is set when the 'send to VoiceMail every time' option is set.

ASTERISK-25691

Change-Id: Iaf0c9f0fa00545e7366443875e2bb7d9a89a1358