organize imports

src/main/java/com/owncloud/android/ui/activity/FileDisplayActivity.java

@@ -60,7 +60,6 @@ import android.widget.Toast;
 
 import com.owncloud.android.MainApp;
 import com.owncloud.android.R;
-import com.owncloud.android.authentication.AccountUtils;
 import com.owncloud.android.datamodel.FileDataStorageManager;
 import com.owncloud.android.datamodel.OCFile;
 import com.owncloud.android.db.PreferenceManager;