fix exploitability of nuke and ion cannon

OpenRA.Mods.Cnc/IonCannonPower.cs

@@ -26,6 +26,8 @@ namespace OpenRA.Mods.Cnc
 
 		public void ResolveOrder(Actor self, Order order)
 		{
+			if (!IsReady) return;
+
 			if (order.OrderString == "IonCannon")
 			{
 				Owner.World.AddFrameEndTask(w =>

OpenRA.Mods.RA/SupportPowers/NukePower.cs

@@ -33,7 +33,7 @@ namespace OpenRA.Mods.RA
 
 		public void ResolveOrder(Actor self, Order order)
 		{
-			if (!IsAvailable) return;
+			if (!IsReady) return;
 
 			if (order.OrderString == "NuclearMissile")
 			{