Fix error with non-existing function (#112)

Co-authored-by: Andrei Tiurin <andreiitiurin@gmail.com>

Author: andruum

fsrs/fsrs.py

@@ -637,8 +637,8 @@ def review_card(
                     card.stability = self._next_stability(
                         difficulty=card.difficulty,
                         stability=card.stability,
-                        retrievability=card.get_retrievability(
-                            scheduler_parameters=self.parameters,
+                        retrievability=self.get_card_retrievability(
+                            card,
                             current_datetime=review_datetime,
                         ),
                         rating=rating,