Motorized wheelchairs can be upgraded again (#91823)

## About The Pull Request
- Fixes #91822

## Changelog
🆑
fix: motorized wheelchairs can be upgraded again
/🆑

code/datums/components/crafting/equipment.dm

@@ -72,6 +72,8 @@
 		/obj/item/stock_parts/power_store/cell = 1,
 	)
 	parts = list(
+		/obj/item/stock_parts/servo = 2,
+		/obj/item/stock_parts/capacitor = 1,
 		/obj/item/stock_parts/power_store/cell = 1,
 	)
 	tool_behaviors = list(TOOL_WELDER, TOOL_SCREWDRIVER, TOOL_WRENCH)

code/modules/vehicles/motorized_wheelchair.dm

@@ -41,12 +41,15 @@
 	AddElement(/datum/element/ridable, /datum/component/riding/vehicle/wheelchair/motorized)
 
 /obj/vehicle/ridden/wheelchair/motorized/on_craft_completion(list/components, datum/crafting_recipe/current_recipe, atom/crafter)
-	// This wheelchair was crafted, so clean out default parts
-	qdel(power_cell)
-	component_parts = list()
+	. = ..()
 
+	// This wheelchair was crafted, so clean out default parts
+	QDEL_NULL(power_cell)
+
+	component_parts = list()
 	for(var/obj/item/stock_parts/part in contents)
-		if(istype(part, /obj/item/stock_parts/power_store/cell)) // power cell, physically moves into the wheelchair
+		// power cell, physically moves into the wheelchair
+		if(istype(part, /obj/item/stock_parts/power_store/cell))
 			power_cell = part
 			continue
 
@@ -55,10 +58,9 @@
 		if(isnull(newstockpart))
 			CRASH("No corresponding datum/stock_part for [part.type]")
 		component_parts += newstockpart
+		qdel(part)
 	refresh_parts()
 
-	return ..()
-
 /obj/vehicle/ridden/wheelchair/motorized/proc/refresh_parts()
 	speed = 1 // Should never be under 1
 	for(var/datum/stock_part/servo/servo in component_parts)
@@ -163,7 +165,7 @@
 		return
 	. += "Speed: [speed]"
 	. += "Energy efficiency: [power_efficiency]"
-	. += "Power: [power_cell.charge] out of [power_cell.maxcharge]"
+	. += "Power: [display_energy(power_cell.charge)] out of [display_energy(power_cell.maxcharge)]"
 
 /obj/vehicle/ridden/wheelchair/motorized/Move(newloc, direct)
 	. = ..()