HFP: fix parameter to `ConnectAudio`

In a previous CL to rework the function, we missed fixing one caller
from passing a boolean to an integer. While that causes no harm
(since false is 0), we make the change in this CL.

Bug: 269970706
Test: cq
Change-Id: I7c6d11c7dce4047304169f10c91040eda29f8d27