Run check_audio from venv
Run check_audio from venv

Pointed out by @PaulFinch on #238.

Change-Id: I0a112a8dcbe11afe564c96f248fd5f605f9168e0

google/aiyprojects-raspbian,google/aiyprojects-raspbian,google/aiyprojects-raspbian,google/aiyprojects-raspbian,google/aiyprojects-raspbian