Remove unused kwarg in Scan.__init__

Author: ricardoV94

pytensor/scan/op.py

@@ -674,7 +674,6 @@ def __init__(
         typeConstructor: Optional[TensorConstructorType] = None,
         truncate_gradient: int = -1,
         name: Optional[str] = None,
-        as_while: bool = False,
         profile: Optional[Union[str, bool]] = None,
         allow_gc: bool = True,
         strict: bool = True,