Revert "[Output Switcher] Enable volume control for single cast device"

This reverts commit ad724437bd.

Reason for revert: unreliable signal

Change-Id: I373dd03cfe1c4711d83ae4f3105f561420a5df2e

packages/SystemUI/src/com/android/systemui/media/dialog/MediaOutputController.java

@@ -539,7 +539,8 @@ public class MediaOutputController implements LocalMediaManager.DeviceCallback {
     }
 
     boolean isVolumeControlEnabled(@NonNull MediaDevice device) {
-        return !device.getFeatures().contains(MediaRoute2Info.FEATURE_REMOTE_GROUP_PLAYBACK)
+        // TODO(b/202500642): Also enable volume control for remote non-group sessions.
+        return !isActiveRemoteDevice(device)
             || mVolumeAdjustmentForRemoteGroupSessions;
     }