Skip caching get_all_state while setting rules

Since rules have not been set for later worlds, the cache believes the completion condition is freely available if it had been placed previously, which breaks beatable-only key placement.

BaseClasses.py

@@ -213,7 +213,7 @@ class MultiWorld():
         except KeyError as e:
             raise KeyError('No such dungeon %s for player %d' % (dungeonname, player)) from e
 
-    def get_all_state(self) -> CollectionState:
+    def get_all_state(self, save_cache=True) -> CollectionState:
         cached = getattr(self, "_all_state", None)
         if cached:
             return cached.copy()
@@ -229,7 +229,8 @@ class MultiWorld():
                 subworld.collect(ret, item)
         ret.sweep_for_events()
         
-        self._all_state = ret
+        if save_cache:
+            self._all_state = ret
         return ret
 
     def get_items(self) -> list: