Fixes laser rifle fire delay + fixes safety overlays (#8731)

code/modules/projectiles/gun.dm

@@ -125,6 +125,7 @@
 
 	if(has_safety)
 		cut_overlay(safety_overlay, TRUE)
+		safety_overlay = null
 		if(!isturf(loc)) // In a mob, holster or bag or something
 			safety_overlay = image(gun_gui_icons,"[safety()]")
 			add_overlay(safety_overlay, TRUE)

code/modules/projectiles/guns/energy/rifle.dm

@@ -46,6 +46,8 @@
 	has_item_ratio = FALSE // the back and suit slots have ratio sprites but the in-hands dont
 	fire_sound = 'sound/weapons/Laser.ogg'
 	max_shots = 15
+	fire_delay = 5
+	burst_delay = 5
 	origin_tech = list(TECH_COMBAT = 3, TECH_MAGNET = 2)
 	projectile_type = /obj/item/projectile/beam
 	secondary_projectile_type = null