add self param to OnCancel

OpenRA.Mods.RA/Activities/FlyTimed.cs

@@ -40,7 +40,7 @@ namespace OpenRA.Mods.RA.Activities
 			return this;
 		}
 
-		protected override bool OnCancel()
+		protected override bool OnCancel( Actor self )
 		{
 			return Interruptible;
 		}

OpenRA.Mods.RA/Activities/IdleAnimation.cs

@@ -37,7 +37,7 @@ namespace OpenRA.Mods.RA.Activities
 			return this;
 		}
 
-		protected override bool OnCancel()
+		protected override bool OnCancel( Actor self )
 		{
 			active = false;
 			return true;

OpenRA.Mods.RA/Activities/Wait.cs

@@ -30,7 +30,7 @@ namespace OpenRA.Mods.RA.Activities
 			return this;
 		}
 
-		protected override bool OnCancel()
+		protected override bool OnCancel( Actor self )
 		{
 			if( !interruptable ) return false;
 			remainingTicks = 0;