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

packages/SystemUI/src/com/android/systemui/screenrecord/RecordingService.java

diff --git a/packages/SystemUI/src/com/android/systemui/screenrecord/RecordingService.java b/packages/SystemUI/src/com/android/systemui/screenrecord/RecordingService.java
index ac94f39..b2c01e1 100644
--- a/packages/SystemUI/src/com/android/systemui/screenrecord/RecordingService.java
+++ b/packages/SystemUI/src/com/android/systemui/screenrecord/RecordingService.java
@@ -82,7 +82,7 @@
     private final RecordingController mController;
     protected final KeyguardDismissUtil mKeyguardDismissUtil;
     private final Handler mMainHandler;
-    private ScreenRecordingAudioSource mAudioSource;
+    private ScreenRecordingAudioSource mAudioSource = ScreenRecordingAudioSource.NONE;
     private boolean mShowTaps;
     private boolean mOriginalShowTaps;
     private ScreenMediaRecorder mRecorder;