Minor fix to validate checkpoint with model state instead of state (#962)

Author: caroteu

micro_sam/util.py

@@ -394,7 +394,7 @@ def get_sam_model(
         # To get the model weights, we prioritize having the correct 'checkpoint_path' over 'model_type'
         # It is done to avoid strange parameter mismatch issues while incompatible model type and weights combination.
         from micro_sam.models.build_sam import _validate_model_type
-        _provided_model_type = _validate_model_type(state)
+        _provided_model_type = _validate_model_type(model_state)
 
         # Verify whether the 'abbreviated_model_type' matches the '_provided_model_type'
         # Otherwise replace 'abbreviated_model_type' with the later.