Fixed projectile effect runtime

Only showing the impact effect without the rest of the tracer would look a
bit silly anyway.

code/modules/projectiles/projectile.dm

@@ -141,7 +141,6 @@
 /obj/item/projectile/proc/launch_from_gun(atom/target, mob/user, obj/item/weapon/gun/launcher, var/target_zone, var/x_offset=0, var/y_offset=0)
 	if(user == target) //Shooting yourself
 		user.bullet_act(src, target_zone)
-		on_impact(user)
 		qdel(src)
 		return 0