MuleBOT UI/ID Fixes (#81380)

## About The Pull Request

- Fixes https://github.com/tgstation/tgstation/issues/81363
- Fixes unable to set MuleBOT home from control panel
- Fixes missing MuleBOT ID from Botkeeper PDA app
- Adds input validation for changing MuleBOT ID from control panel
- Removes hardcoding of MuleBOT IDs and home destinations
- MuleBOT will now automatically set its home to the navigation beacon
on its initialization turf

## Changelog

🆑 LT3
fix: MULEbot will correctly display its loaded cargo on BotKeeper
fix: MULEbot home beacon can be set from control panel
code: MULEbot home location is automatically set on init
/🆑

code/modules/modular_computers/file_system/programs/robocontrol.dm

@@ -49,6 +49,7 @@
 			var/mob/living/simple_animal/bot/mulebot/simple_mulebot = simple_bot
 			mulelist += list(list(
 				"name" = simple_mulebot.name,
+				"id" = simple_mulebot.id,
 				"dest" = simple_mulebot.destination,
 				"power" = simple_mulebot.cell ? simple_mulebot.cell.percent() : 0,
 				"home" = simple_mulebot.home_destination,
@@ -56,9 +57,8 @@
 				"autoPickup" = simple_mulebot.auto_pickup,
 				"reportDelivery" = simple_mulebot.report_delivery,
 				"mule_ref" = REF(simple_mulebot),
+				"load" = simple_mulebot.get_load_name(),
 			))
-			if(simple_mulebot.load)
-				data["load"] = simple_mulebot.load.name
 			newbot["mule_check"] = TRUE
 		botlist += list(newbot)