Makes EMP logs less bad (#93841)

## About The Pull Request

closes #93805

## Why It's Good For The Game

we actually have almost no emp logging at all lol, not even emp chem
reaction, so you barely can track potential griefer?

## Changelog

🆑
admin: EMP logs are improved, additionally chemical EMP reactions are
now logged.
/🆑

code/modules/projectiles/projectile/bullets/cannonball.dm

@@ -57,7 +57,7 @@
 	damage = 15 //very low
 
 /obj/projectile/bullet/cannonball/emp/on_hit(atom/target, blocked = 0, pierce_hit)
-	empulse(src, 4, 10)
+	empulse(src, 4, 10, emp_source = src)
 	. = ..()
 
 /obj/projectile/bullet/cannonball/biggest_one

code/modules/projectiles/projectile/bullets/sniper.dm

@@ -50,7 +50,7 @@
 	if(issilicon(target)) //also especially good against borgs
 		var/mob/living/silicon/borg_boy = target
 		borg_boy.apply_damage(damage, BRUTE)
-	empulse(target, emp_radius, emp_radius)
+	empulse(target, emp_radius, emp_radius, emp_source = src)
 
 /obj/projectile/bullet/p50/incendiary
 	name =".50 BMG incendiary bullet"

code/modules/projectiles/projectile/special/ion.dm

@@ -9,7 +9,7 @@
 
 /obj/projectile/ion/on_hit(atom/target, blocked = 0, pierce_hit)
 	..()
-	empulse(target, emp_radius, emp_radius)
+	empulse(target, emp_radius, emp_radius, emp_source = src)
 	return BULLET_ACT_HIT
 
 /obj/projectile/ion/weak