[MIRROR] Clears unused research var (#12685)

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

code/modules/assembly/assembly.dm

@@ -10,7 +10,6 @@
 	throw_range = 10
 	drop_sound = 'sound/items/drop/component.ogg'
 	pickup_sound =  'sound/items/pickup/component.ogg'
-	origin_tech = list(TECH_MAGNET = 1)
 
 	var/secured = 1
 	var/list/attached_overlays = null

code/modules/assembly/igniter.dm

@@ -2,7 +2,6 @@
 	name = "igniter"
 	desc = "A small electronic device able to ignite combustable substances."
 	icon_state = "igniter"
-	origin_tech = list(TECH_MAGNET = 1)
 	matter = list(MAT_STEEL = 500, MAT_GLASS = 50)
 
 	secured = 1

code/modules/assembly/infrared.dm

@@ -4,7 +4,6 @@
 	name = "infrared emitter"
 	desc = "Emits a visible or invisible beam and is triggered when the beam is interrupted."
 	icon_state = "infrared"
-	origin_tech = list(TECH_MAGNET = 2)
 	matter = list(MAT_STEEL = 1000, MAT_GLASS = 500)
 
 	wires = WIRE_PULSE

code/modules/assembly/mousetrap.dm

@@ -2,7 +2,6 @@
 	name = "mousetrap"
 	desc = "A handy little spring-loaded trap for catching pesty rodents."
 	icon_state = "mousetrap"
-	origin_tech = list(TECH_COMBAT = 1)
 	matter = list(MAT_STEEL = 100)
 	var/armed = 0
 	special_handling = TRUE

code/modules/assembly/proximity.dm

@@ -2,7 +2,6 @@
 	name = "proximity sensor"
 	desc = "Used for scanning and alerting when someone enters a certain proximity."
 	icon_state = "prox"
-	origin_tech = list(TECH_MAGNET = 1)
 	matter = list(MAT_STEEL = 800, MAT_GLASS = 200)
 	wires = WIRE_PULSE
 

code/modules/assembly/signaler.dm

@@ -3,7 +3,6 @@
 	desc = "Used to remotely activate devices.  Tap against another secured signaler to transfer configuration."
 	icon_state = "signaller"
 	item_state = "signaler"
-	origin_tech = list(TECH_MAGNET = 1)
 	matter = list(MAT_STEEL = 1000, MAT_GLASS = 200)
 	wires = WIRE_RECEIVE | WIRE_PULSE | WIRE_RADIO_PULSE | WIRE_RADIO_RECEIVE
 

code/modules/assembly/timer.dm

@@ -2,7 +2,6 @@
 	name = "timer"
 	desc = "Used to time things. Works well with contraptions which has to count down. Tick tock."
 	icon_state = "timer"
-	origin_tech = list(TECH_MAGNET = 1)
 	matter = list(MAT_STEEL = 500, MAT_GLASS = 50)
 
 	wires = WIRE_PULSE

code/modules/assembly/voice.dm

@@ -2,7 +2,6 @@
 	name = "voice analyzer"
 	desc = "A small electronic device able to record a voice sample, and send a signal when that sample is repeated."
 	icon_state = "voice"
-	origin_tech = list(TECH_MAGNET = 1)
 	matter = list(MAT_STEEL = 500, MAT_GLASS = 50)
 	var/listening = 0
 	var/recorded	//the activation message