fix: remove MsgItem(SetEquipItem) that undoes equipment visuals

- MsgItemInfo already handles equip + 3D model update via sub_86A992

- SetEquipItem (action 5) zeroes item data via sub_410E8E, clearing the visual

- Removed from EquipItem, UnequipItem (revert EquipmentMode), and LoadEquips

Co-Authored-By: Claude Opus 4.6