fixes #5970, prevents bugs in the future

this is not an issue at the moment but will become one should maxHealth ever get changed.

code/modules/mob/living/silicon/robot/robot_damage.dm

@@ -1,9 +1,9 @@
 /mob/living/silicon/robot/updatehealth()
 	if(status_flags & GODMODE)
-		health = 200
+		health = maxHealth
 		stat = CONSCIOUS
 		return
-	health = 200 - (getBruteLoss() + getFireLoss())
+	health = maxHealth - (getBruteLoss() + getFireLoss())
 	return
 
 /mob/living/silicon/robot/getBruteLoss()
@@ -144,4 +144,4 @@
 		brute	-= (picked.brute_damage - brute_was)
 		burn	-= (picked.electronics_damage - burn_was)
 
-		parts -= picked
+		parts -= picked