Show the current stream's volume in the volume panel.

Bug: 5409969

If the current stream being displayed is different from the
stream being adjusted, rearrange the sliders, unless multiple
sliders are being shown.

Change-Id: Ia48986c1046305d7fee7a32177d78d8ffd84a11b

core/java/android/view/VolumePanel.java

@@ -400,7 +400,7 @@ public class VolumePanel extends Handler implements OnSeekBarChangeListener, Vie
         if (LOGD) Log.d(TAG, "onVolumeChanged(streamType: " + streamType + ", flags: " + flags + ")");
 
         if ((flags & AudioManager.FLAG_SHOW_UI) != 0) {
-            if (mActiveStreamType == -1) {
+            if (mActiveStreamType != streamType) {
                 reorderSliders(streamType);
             }
             onShowVolumeChanged(streamType, flags);