[MIRROR] Clears unused research var (#12685)

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

code/modules/mining/drilling/scanner.dm

@@ -4,7 +4,6 @@
 	icon = 'icons/obj/device.dmi'
 	icon_state = "deep_scan_device"
 	item_state = "electronic"
-	origin_tech = list(TECH_MAGNET = 1, TECH_ENGINEERING = 1)
 	matter = list(MAT_STEEL = 150)
 	var/scan_time = 2 SECONDS
 	var/range = 2
@@ -108,7 +107,6 @@
 	name = "advanced ore detector"
 	desc = "An advanced device used to locate ore deep underground."
 	description_info = "This scanner has variable range, you can use the Set Scanner Range verb, or alt+click the device. Drills dig in 5x5."
-	origin_tech = list(TECH_MAGNET = 4, TECH_ENGINEERING = 4)
 	matter = list(MAT_STEEL = 150)
 	scan_time = 0.5 SECONDS
 	exact = TRUE