Update EncDecClassificationDatasetConfig Dataclass
This pull request **introduces 4 alerts** when merging f0e045e8eee83caf8d2db6464752d36f76871aa2 into 0f9a772feea56397479d06354ee4fcb9db8c6b04 - [view on LGTM.com](https://lgtm.com/projects/g/NVIDIA/NeMo/rev/pr-23db6c861086ff7b5c8149283645de15e29f3d75)

**new alerts:**

* 4 for Unused import