Slight decloner damage nerf, Tumors are now a chance (#23102)

Reduces decloner damage so it falls just under the threshold to give a
tumor, on all but the most powerful guns.

Tumors from genetic damage are now also a chance, rather than guaranteed
at any genetic damage over 10.
You are guaranteed to have at least one tumor if your limb reaches
maximum genetic damage.

code/modules/projectiles/modular/laser_components.dm

@@ -472,7 +472,7 @@
 	name = "decloner modulator"
 	desc = "Modulates the beam into firing highly radioactive particulates."
 	projectile = /obj/projectile/energy/declone
-	damage = 0.5
+	damage = 0.4
 	icon_state = "decloner"
 	firing_sound = 'sound/weapons/pulse3.ogg'
 	origin_tech = list(TECH_COMBAT = 4, TECH_MATERIAL = 4, TECH_POWER = 3)