Fix expected value for repr in Keras

Signed-off-by: Beat Buesser <[email protected]>

Author: Beat Buesser

tests/estimators/classification/test_deeplearning_common.json

@@ -424,7 +424,7 @@
         "channels_first=False",
         "clip_values=array([0., 1.], dtype=float32)",
         "preprocessing_defences=None",
-        "preprocessing=[(mean=0, std=1, apply_fit=True, apply_predict=True)",
+        "preprocessing=StandardisationMeanStd(mean=0, std=1, apply_fit=True, apply_predict=True)",
         "input_layer=0, output_layer=0"
     ],
     "test_repr_kerastf": [