Adds an electric welding tool to Chief Engineer toolbelts and the ERT…

… utility belt (#3999)

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## About The Pull Request

This PR adds an electric welding tool to chief engineering belts and ERT
utility belts.

## Why It's Good For The Game

The chief engineer's belt is currently missing a welding tool, and I
felt that it may make sense to use an electric welder here for that.

## Changelog

:cl:
add: Added electrical welding tools to the populate lists for CE belts
and ERT utility belts
/:cl:

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code/game/objects/items/storage/belt.dm

@@ -94,11 +94,11 @@
 /obj/item/storage/belt/utility/chief/full/PopulateContents()
 	new /obj/item/screwdriver/power(src)
 	new /obj/item/crowbar/power(src)
+	new /obj/item/weldingtool/electric(src)
 	new /obj/item/multitool(src)
 	new /obj/item/stack/cable_coil(src,MAXCOIL,pick("red","yellow","orange"))
 	new /obj/item/extinguisher/mini(src)
 	new /obj/item/analyzer(src)
-	//much roomier now that we've managed to remove two tools
 
 /obj/item/storage/belt/utility/full/PopulateContents()
 	new /obj/item/screwdriver(src)
@@ -149,6 +149,7 @@
 /obj/item/storage/belt/utility/full/ert/PopulateContents()
 	new /obj/item/screwdriver/power(src)
 	new /obj/item/crowbar/power(src)
+	new /obj/item/weldingtool/electric(src)
 	new /obj/item/multitool(src)
 	new /obj/item/construction/rcd/combat(src)
 	new /obj/item/extinguisher/mini(src)