Fix place npc iuse

[ZhilkinSerg]

Summary

SUMMARY: Bugfixes "Fix place npc iuse"

Purpose of change

Follow-up after #36358.

Describe the solution

Fixed logic in calculating npc placement target point.

Testing

1. Use following iuse actions on any two items to test npc placement via iuse function:

    "use_action": [{
        
        "type": "place_npc", 
        "npc_class_id": "true_foodperson", 
        "summon_msg": "You summon a food hero (random)!",
        "place_randomly": true, 
        "moves": 50
    }]

    "use_action": [{
        
        "type": "place_npc", 
        "npc_class_id": "true_foodperson", 
        "summon_msg": "You summon a food hero (direction)!",
        "place_randomly": false, 
        "moves": 50
    }]

Additional context

#37908 (comment)
#36358 (comment)