Ringer: Use internal ringer mode when determining vibration.

Bug: 17884168
Change-Id: I0aca94c0637db894dfc4b01d7e280b252394c69a
diff --git a/src/com/android/server/telecom/Ringer.java b/src/com/android/server/telecom/Ringer.java
index 5945306..6b46a71 100644
--- a/src/com/android/server/telecom/Ringer.java
+++ b/src/com/android/server/telecom/Ringer.java
@@ -252,7 +252,7 @@
 
     private boolean shouldVibrate(Context context) {
         AudioManager audioManager = (AudioManager) context.getSystemService(Context.AUDIO_SERVICE);
-        int ringerMode = audioManager.getRingerMode();
+        int ringerMode = audioManager.getRingerModeInternal();
         if (getVibrateWhenRinging(context)) {
             return ringerMode != AudioManager.RINGER_MODE_SILENT;
         } else {