Change VVM3 default prompt level to no guest prompts

The telephone user interface language setting also affects how much
instruction is given to the user. The default prompt level is specified
to be "standard for user, none for caller". Before this CL it was
"standard for user and caller", which is corrected.

Change-Id: Ib8cb597e0bd93149f49bbc9609ea82962880549c
Fixes: 29242725
1 file changed