Vorepanel fixes + VTEC toggle

fixed typo in the vorepanel tgui, resulting in Item Vorebelly Size Mult: not being changebale
fixed a wrong variable use which led to broken sprites in case the Mob Vorebelly Size Mult: was tset to 0.
added VTEC toggle.

code/game/objects/items/robot/robot_upgrades.dm

@@ -86,9 +86,9 @@
 /obj/item/borg/upgrade/vtec/action(var/mob/living/silicon/robot/R)
 	if(..()) return 0
 
-	if(R.speed == -1)
+	if(R.speed == -1 || (/mob/living/silicon/robot/proc/toggle_vtec in R.verbs))
 		return 0
-
+	R.verbs += /mob/living/silicon/robot/proc/toggle_vtec
 	R.speed--
 	return 1
 
@@ -214,4 +214,4 @@
 	R.add_language(LANGUAGE_TERMINUS, 1)
 	R.add_language(LANGUAGE_ZADDAT, 1)
 
-	return 1
+	return 1