fix: use current world infos to compute worlds to remove (#315)

When computing worlds to remove, we need to look into current world infos, not the new ones. Previous code would raise key error since we were trying to find a world name that was not present in new world infos data structure.

Author: raresgaia123

infscale/execution/config_manager.py

@@ -85,7 +85,7 @@ def get_worlds_to_add_and_remove(self) -> tuple[list[WorldInfo], list[WorldInfo]
         cur = self._world_infos.keys()
 
         worlds_to_add = [new_world_infos[name] for name in new - cur]
-        worlds_to_remove = [new_world_infos[name] for name in cur - new]
+        worlds_to_remove = [self._world_infos[name] for name in cur - new]
 
         return worlds_to_add, worlds_to_remove