Kicking a grille does 2 less damage; fix for #4557

It will now take 10 hits to destroy it without using a weapon or tools.

Take that,metagamers!

code/game/objects/structures/grille.dm

@@ -67,7 +67,7 @@
 	if(M_HULK in user.mutations)
 		health -= 5
 	else
-		health -= 3
+		health -= 1
 	healthcheck()
 
 /obj/structure/grille/attack_alien(mob/user as mob)
@@ -241,4 +241,4 @@
 		if(exposed_temperature > T0C + 1500)
 			health -= 1
 			healthcheck()
-	..()
+	..()