Equipping 2 UPS on different legs causes UPS welder to fail when crafting with it

[TobalJackson]

Describe the bug

Putting 2 UPS on the same leg, then switching one to the other leg results in crafting with a modded arc welder (UPS mod) saying You no longer have a none and can't continue crafting until you remove one of the UPS and reload your game

Steps To Reproduce

1. Wear 2 crafted UPS on same leg (left)
2. Mod makeshift electric welder with UPS conversion mod
3. After starting a craft requiring the welder (which shows green in required tools) notice the error message, You no longer have a none and can't continue crafting
4. Try moving around UPS to no avail
5. remove 1 equipped UPS and restart game
6. crafting now works.

Expected behavior

Equipping multiple UPS on different legs should function the same as equipping them on the same leg.

Versions and configuration

• OS: Ubuntu 18.04.4 LTS
• Game Version: 0.E-2 [64-bit]
• Graphics version: Tiles
• Ingame language: English
• Mods loaded: dda, no_npc_food, sees_player_retro, aftershock, crt_expansion, magiclysm

Additional context