Make Shadow Servants constantly loaded, even when away from players

[grm9]

Removing Maxwell's Shadow Servants whenever they get unloaded prevents players from spawning them at a place with resources to gather (e.g. a place with multiple trees) and being able to come back and pick up the already gathered resources, which is useful for early-game.

Imo making it this way is better, even if this isn't the intended use for Shadow Servants, because it can already be done by picking up only the grass/twigs/berries nearby the clone to not unload it, just slightly less convenient to do than moving to wherever there's more items to pick up and coming back when the Shadow Servant expires instead of only picking up the stuff in the vicinity of the Shadow Servant.