Store last position when scheduling as review (#1800)

rslib/src/scheduler/reviews.rs

@@ -41,6 +41,7 @@ impl Card {
     }
 
     fn schedule_as_review(&mut self, interval: u32, due: i32, ease_factor: u16) {
+        self.original_position = self.last_position();
         self.remove_from_filtered_deck_before_reschedule();
         self.interval = interval.max(1);
         self.due = due;