Update VideoItemDetailActivity.java

app/src/main/java/org/schabi/newpipe/VideoItemDetailActivity.java

@@ -1,6 +1,7 @@
 package org.schabi.newpipe;
 
 import android.content.Intent;
+import android.media.AudioManager;
 import android.os.Bundle;
 import android.preference.PreferenceManager;
 import android.support.v4.app.NavUtils;