fix(pt/tf/dp): normalize the econf (#3976)

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## Summary by CodeRabbit

- **Improvements**
- Enhanced the accuracy of energy configuration embeddings by adding a
normalization step.

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deepmd/dpmodel/utils/type_embed.py

@@ -234,5 +234,6 @@ def get_econf_tebd(type_map, precision: str = "default"):
         [electronic_configuration_embedding[kk] for kk in type_map],
         dtype=PRECISION_DICT[precision],
     )
+    econf_tebd /= econf_tebd.sum(-1, keepdims=True)  # do normalization
     embed_input_dim = ECONF_DIM
     return econf_tebd, embed_input_dim