fix clone score (deeplearning4j#10200)

issue: deeplearning4j#10191

Author: sdyura

deeplearning4j/deeplearning4j-nn/src/main/java/org/deeplearning4j/nn/multilayer/MultiLayerNetwork.java

@@ -1529,6 +1529,7 @@ public MultiLayerNetwork clone() {
             }
             ret.setLayers(clonedLayers);
         }
+        ret.score = this.score;
         return ret;
     }