Propagate mute event to both ring volume slices

Fix a bug where introduction of a separate_ring_volume slice meant that
the original ring_volume slice would not get notified of ring stream
muting event.

Bug: b/266855922

Test: make DEBUG_ROBOLECTRIC=1 ROBOTEST_FILTER=VolumeSliceHelperTest RunSettingsRoboTests -j40
Change-Id: Ifb5ebe4e7d9bde3d14336891cce3fbee167a5911

src/com/android/settings/slices/VolumeSliceHelper.java

@@ -115,7 +115,9 @@ public class VolumeSliceHelper {
             for (Map.Entry<Uri, Integer> entry : sRegisteredUri.entrySet()) {
                 if (entry.getValue() == inputType) {
                     context.getContentResolver().notifyChange(entry.getKey(), null /* observer */);
-                    break;
+                    if (inputType != AudioManager.STREAM_RING) { // Two URIs are mapped to ring
+                        break;
+                    }
                 }
             }
         }