Sound: VolumeSeekBarPreference must observe min vol index

The volume sliders must observe the minimum volume stream
  index, not just the maximum.

Bug: 74985293
Test: try to mute alarms through UI and fail
Change-Id: Icc5173898eb951239d02f5822239085f1ec3fc9a

src/com/android/settings/notification/VolumeSeekBarPreference.java

@@ -83,6 +83,7 @@ public class VolumeSeekBarPreference extends SeekBarPreference {
     public void setStream(int stream) {
         mStream = stream;
         setMax(mAudioManager.getStreamMaxVolume(mStream));
+        setMin(mAudioManager.getStreamMinVolume(mStream));
         setProgress(mAudioManager.getStreamVolume(mStream));
     }