Core: Change remaining fill to check for location.can_fill instead of only location.item_rule

[NewSoupVi]

The much simpler, but slower alternative to https://github.com/ArchipelagoMW/Archipelago/pull/3738

This makes remaining fill not place useful items on excluded locations, which Fill takes care of by calling remaining_fill twice, but worlds that might want to use remaining_fill themselves shouldn't have to