AudioAssetBuilder did not extend BinaryAssetModelBuilder

ccm-cms/src/main/java/org/librecms/pages/models/AudioAssetModelBuilder.java

@@ -28,7 +28,7 @@ import javax.transaction.Transactional;
  * @author <a href="mailto:jens.pelzetter@googlemail.com">Jens Pelzetter</a>
  */
 public class AudioAssetModelBuilder
-    extends AbstractAssetModelBuilder<AudioAsset, AudioAssetModel> {
+    extends BinaryAssetModelBuilder<AudioAsset, AudioAssetModel> {
 
     @Inject
     private LegalMetadataModelBuilder legalMetadataModelBuilder;