Remove AbortOnResupply from Aircraft again

This was accidentally re-added during a rebase in
a previous PR.

OpenRA.Mods.Common/Traits/Air/Aircraft.cs

@@ -87,9 +87,6 @@ namespace OpenRA.Mods.Common.Traits
 		[Desc("Does this VTOL actor need to turn before landing on a resupplier?")]
 		public readonly bool TurnToDock = true;
 
-		[Desc("Does this actor cancel its previous activity after resupplying?")]
-		public readonly bool AbortOnResupply = true;
-
 		[Desc("Does this actor automatically take off after resupplying?")]
 		public readonly bool TakeOffOnResupply = false;