Fix unload zones when unload target is on the zone's edge

[dseguin]

Summary

None

Purpose of change

• Fixes Unsorted Strip Zones don't work for a 1x1 #56478

When using a strip zone or an unload-all zone, if the target unload item is on the edge of the zone, the player only performs the sort action if they're standing in the zone.

The unload check is expecting the distance between the player and the zone to be 0:

Cataclysm-DDA/src/activity_item_handling.cpp

Lines 2172 to 2176 in 3d0002b

	// if this item isn't going anywhere and its not sealed
	// check if it is in a unload zone or a strip corpse zone
	// then we should unload it and see what is inside
	if( mgr.has_near( zone_type_zone_unload_all, abspos, 0 ) ||
	( mgr.has_near( zone_type_zone_strip, abspos, 0 ) && it->first->is_corpse() ) ) {

Since the automovement puts the player directly beside the item to unload, this check will fail if the item is on the zone's edge.

Describe the solution

Increase the zone's range check to 1 (preferred solution by BombasticSlacks).

Describe alternatives you've considered

Make the automovement put the player directly on the zone (not adjacent) if the zone is one of the two above.

Testing

2022-03-30.17-58-54.mp4

Additional context

[bombasticSlacks]

Reasoning for this solution is so it still works if the items are in a furniture you can't otherwise share a tile with.