Fix Section.accessory setter not updating view bindings

Author: Rapptz

discord/ui/section.py

@@ -117,6 +117,7 @@ def accessory(self, value: Item[V]) -> None:
         if not isinstance(value, Item):
             raise TypeError(f'Expected an Item, got {value.__class__.__name__!r} instead')
 
+        value._update_view(self.view)
         value._parent = self
         self._accessory = value