Fix DamagedWithoutFoundation causing more damage than it should

Tick caused extra damage in addition to the damage in AddedToWorld,
which lead the actor to have less health than damageThreshold.

OpenRA.Mods.D2k/Traits/Buildings/DamagedWithoutFoundation.cs

@@ -64,6 +64,8 @@ namespace OpenRA.Mods.D2k.Traits
 			var delta = health.HP - damageThreshold;
 			if (delta > 0)
 				health.InflictDamage(self, self.World.WorldActor, delta, null, false);
+
+			damageTicks = info.WeaponInfo.ReloadDelay;
 		}
 
 		public void Tick(Actor self)