fix: dpmodel zbl rcut sel (#4339)

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-->

## Summary by CodeRabbit

- **New Features**
- Enhanced parameter handling in the model retrieval process for
improved efficiency.
- Default model type set to "standard" for better robustness when input
data is incomplete.

- **Bug Fixes**
- Improved encapsulation of the descriptor object to prevent potential
errors with direct data access.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

Co-authored-by: Han Wang <92130845+wanghan-iapcm@users.noreply.github.com>

Author: anyangml

deepmd/dpmodel/model/model.py

@@ -80,8 +80,8 @@ def get_zbl_model(data: dict) -> DPZBLModel:
     filepath = data["use_srtab"]
     pt_model = PairTabAtomicModel(
         filepath,
-        data["descriptor"]["rcut"],
-        data["descriptor"]["sel"],
+        descriptor.get_rcut(),
+        descriptor.get_sel(),
         type_map=data["type_map"],
     )