fix(android) set stream type hardware buttons should control

Ref:
https://developer.android.com/reference/android/app/Activity#setVolumeControlStream(int)

android/sdk/src/main/java/org/jitsi/meet/sdk/AudioModeModule.java

 
 package org.jitsi.meet.sdk;
 
+import android.app.Activity;
 import android.content.Context;
 import android.media.AudioManager;
 import android.os.Build;
             return;
         }
 
+        Activity currentActivity = getCurrentActivity();
+        if (currentActivity != null) {
+            if (mode == DEFAULT) {
+                currentActivity.setVolumeControlStream(AudioManager.USE_DEFAULT_STREAM_TYPE);
+            } else {
+                currentActivity.setVolumeControlStream(AudioManager.STREAM_VOICE_CALL);
+            }
+        }
+
         runInAudioThread(new Runnable() {
             @Override
             public void run() {