fix wall burning runtime, balance rwalls

rwalls are half as strong again because they took way too long
 to burn down

Signed-off-by: Mloc-Argent <colmohici@gmail.com>

code/__HELPERS/maths.dm

@@ -1,3 +1,5 @@
+#define RAND_F(L, H) (rand()*(H-L) + L)
+
 // Credits to Nickr5 for the useful procs I've taken from his library resource.
 
 var/const/E		= 2.71828183

code/game/turfs/simulated/walls.dm

@@ -117,7 +117,7 @@
 
 /turf/simulated/wall/adjacent_fire_act(turf/simulated/floor/adj_turf, datum/gas_mixture/adj_air, adj_temp, adj_volume)
 	if(adj_temp > max_temperature)
-		take_damage(log(rand(0.9, 1.1) * (adj_temp - max_temperature)))
+		take_damage(log(RAND_F(0.9, 1.1) * (adj_temp - max_temperature)))
 
 	return ..()
 

code/game/turfs/simulated/walls_reinforced.dm

@@ -5,7 +5,7 @@
 	opacity = 1
 	density = 1
 
-	damage_cap = 1000
+	damage_cap = 500
 	max_temperature = 6000
 	armor = 0.1 // Only 10% damage from gunfire, it's made from strong alloys and stuff.
 
@@ -291,7 +291,7 @@
 		var/obj/item/light_fixture_frame/small/AH = W
 		AH.try_build(src)
 		return
-	
+
 	//Finally, CHECKING FOR FALSE WALLS if it isn't damaged
 	else if(!d_state)
 		return attack_hand(user)