Show "recording issue" text on notification, even when not recording screen.

This bug was happening because mAudioSource had no default value, which
affected an if statement while creating the notification message.

Bug: 305049544
Flag: ACONFIG record_issue_qs_tile DEVELOPMENT
Test: Manually tested that everything works on device.
Change-Id: I61700f3266ec2d4e64a1c301bd56a9b9accd46b9