[MIRROR] Clears unused research var (#12685)

Co-authored-by: Cameron Lennox <killer65311@gmail.com>

code/game/objects/items/stacks/medical.dm

@@ -84,7 +84,6 @@
 	singular_name = "crude bandage length"
 	desc = "Some bandages to wrap around bloody stumps."
 	icon_state = "gauze"
-	origin_tech = list(TECH_BIO = 1)
 	no_variants = FALSE
 	apply_sounds = list('sound/effects/rip1.ogg','sound/effects/rip2.ogg')
 
@@ -151,7 +150,6 @@
 	singular_name = "gauze length"
 	desc = "Some sterile gauze to wrap around bloody stumps."
 	icon_state = "brutepack"
-	origin_tech = list(TECH_BIO = 1)
 	no_variants = FALSE
 	apply_sounds = list('sound/effects/rip1.ogg','sound/effects/rip2.ogg')
 	drop_sound = 'sound/items/drop/gloves.ogg'
@@ -227,7 +225,6 @@
 	singular_name = "ointment"
 	icon_state = "ointment"
 	heal_burn = 1
-	origin_tech = list(TECH_BIO = 1)
 	no_variants = FALSE
 	apply_sounds = list('sound/effects/ointment.ogg')
 	drop_sound = 'sound/items/drop/herb.ogg'
@@ -275,7 +272,6 @@
 	desc = "An advanced trauma kit for severe injuries."
 	icon_state = "traumakit"
 	heal_brute = 7
-	origin_tech = list(TECH_BIO = 1)
 	apply_sounds = list('sound/effects/rip1.ogg','sound/effects/rip2.ogg','sound/effects/tape.ogg')
 
 /obj/item/stack/medical/advanced/bruise_pack/attack(mob/living/carbon/M as mob, mob/user as mob)
@@ -345,7 +341,6 @@
 	desc = "An advanced treatment kit for severe burns."
 	icon_state = "burnkit"
 	heal_burn = 7
-	origin_tech = list(TECH_BIO = 1)
 	apply_sounds = list('sound/effects/ointment.ogg')
 
 /obj/item/stack/medical/advanced/ointment/attack(mob/living/carbon/M as mob, mob/user as mob)

code/game/objects/items/stacks/medical_vr.dm

@@ -28,7 +28,6 @@
 	icon_state = "clotkit"
 	heal_burn = 0
 	heal_brute = 2 // Only applies to non-humans, to give this some slight application on animals
-	origin_tech = list(TECH_BIO = 3)
 	apply_sounds = list('sound/effects/spray.ogg', 'sound/effects/spray2.ogg', 'sound/effects/spray3.ogg')
 	amount = 5
 	max_amount = 5

code/game/objects/items/stacks/nanopaste.dm

@@ -4,7 +4,6 @@
 	desc = "A tube of paste containing swarms of repair nanites. Very effective in repairing robotic machinery."
 	icon = 'icons/obj/stacks_vr.dmi'
 	icon_state = "nanopaste"
-	origin_tech = list(TECH_MATERIAL = 4, TECH_ENGINEERING = 3)
 	amount = 10
 	max_amount = 10
 	toolspeed = 0.75 //Used in surgery, shouldn't be the same speed as a normal screwdriver on mechanical organ repair.

code/game/objects/items/stacks/stack.dm

@@ -11,7 +11,6 @@
 
 /obj/item/stack
 	gender = PLURAL
-	origin_tech = list(TECH_MATERIAL = 1)
 	icon = 'icons/obj/stacks_ch.dmi' //CHOMPedit - materials update
 	randpixel = 7
 	center_of_mass_x = 0

code/game/objects/items/stacks/telecrystal.dm

@@ -7,7 +7,6 @@
 	icon_state = "telecrystal"
 	w_class = ITEMSIZE_TINY
 	max_amount = 240
-	origin_tech = list(TECH_MATERIAL = 6, TECH_BLUESPACE = 4)
 	force = 1 //Needs a token force to ensure you can attack because for some reason you can't attack with 0 force things
 	custom_handling = TRUE
 

code/game/objects/items/stacks/tiles/tile_types.dm

@@ -83,7 +83,6 @@
 	throw_speed = 5
 	throw_range = 20
 	flags = NONE
-	origin_tech = list(TECH_BIO = 1)
 	no_variants = FALSE
 	drop_sound = 'sound/items/drop/herb.ogg'
 	pickup_sound = 'sound/items/pickup/herb.ogg'

code/game/objects/items/stacks/tiles/tile_types_ch.dm

@@ -14,8 +14,6 @@
 
 	//recipes = material.get_recipes()	No.
 	stacktype = material.stack_type
-	if(islist(material.stack_origin_tech))
-		origin_tech = material.stack_origin_tech.Copy()
 
 	if(apply_colour)
 		color = material.icon_colour