Rearming aircraft now reapplies rearming order if canceled on landing structure

- Implemented by making the ResupplyAircraft activity recreate a new resupply activity if cancelled and also having no other queued activities.
- Tested in TD, RA, TS.

OpenRA.Mods.Common/Activities/Air/ResupplyAircraft.cs

@@ -50,6 +50,10 @@ namespace OpenRA.Mods.Common.Activities
 
 		public override Activity Tick(Actor self)
 		{
+			// Conditional fixes being able to stop aircraft from resupplying.
+			if (IsCanceled && NextInQueue == null)
+				OnFirstRun(self);
+
 			return NextActivity;
 		}
 	}