Have isRinging return true when simulated ringing

UI components watch for the return value of isRinging in order to figure
out whether to silence a call on vol-down, so make isRinging return true
when simulated-ringing so that button still works.

Bug: 150320750
Test: atest BackgroundCallAudioTest
Test: manual
Change-Id: I300a789d674e4aa777ac2031f4f7286b4d595614
Merged-In: I300a789d674e4aa777ac2031f4f7286b4d595614
diff --git a/src/com/android/server/telecom/TelecomServiceImpl.java b/src/com/android/server/telecom/TelecomServiceImpl.java
index 2f336b3..0cdb8bc 100644
--- a/src/com/android/server/telecom/TelecomServiceImpl.java
+++ b/src/com/android/server/telecom/TelecomServiceImpl.java
@@ -855,7 +855,7 @@
                     // current state as tracked by PhoneStateBroadcaster, any failure to properly
                     // track the current call state there could result in the wrong ringing state
                     // being reported by this API.
-                    return mCallsManager.hasRingingCall();
+                    return mCallsManager.hasRingingOrSimulatedRingingCall();
                 }
             } finally {
                 Log.endSession();