add config property show_last_review

config.py

@@ -112,6 +112,10 @@ def get_zoom_state(self, state: str) -> float:
     def set_zoom_state(self, state: str, value: float) -> None:
         self._config.setdefault("zoom_states", {})[state] = value
 
+    @property
+    def show_last_review(self) -> bool:
+        return bool(self["show_last_review"])
+
     @property
     def show_reps_done_today(self) -> bool:
         return bool(self["show_reps_done_today"])

top_toolbar.py

@@ -89,7 +89,7 @@ def append_link(cls, links: list, toolbar: Toolbar) -> None:
     @classmethod
     def update(cls, reviewer: Reviewer, card: Card, ease: int) -> None:
         """Called after a card was answered."""
-        if config["show_last_review"] is False:
+        if config.show_last_review is False:
             return
 
         label = config.get_label(ease, cls._last_default_ease)