Emp flashlight cost reduction (#90430)

## About The Pull Request
4 tc -> 2 tc
Since radio jammer now costs 1 tc I don't see a reason why emp
flashlight should cost this much.
Also I would like to see it used more.
## Why It's Good For The Game
Present traitors with a dilemma to solve: how to render their target
unable to scream for help. Right now the obvious choices are radio
jammer (1 tc), emp kit (2 tc) or sleepy pen (4 tc). Lowering costs
presents a new option for stealth traitors.
## Changelog
🆑
balance: emp flashlight costs 4 -> 2 tc
/🆑

code/modules/uplink/uplink_items/stealthy_tools.dm

@@ -62,7 +62,7 @@
 			Useful for disrupting headsets, cameras, doors, lockers and borgs during stealth operations. \
 			Attacking a target with this flashlight will direct an EM pulse at it and consumes a charge."
 	item = /obj/item/flashlight/emp
-	cost = 4
+	cost = 2
 	surplus = 30
 
 /datum/uplink_item/stealthy_tools/emplight/New()