Remove redundant ISync and ITick from Attack* traits

ISync is implemented by AttackBase, so there's no need for other Attack traits to implement it again.
AttackTurreted inherits AttackFollow, which already implements ITick.

OpenRA.Mods.Common/Traits/Attack/AttackFollow.cs

@@ -20,7 +20,7 @@ namespace OpenRA.Mods.Common.Traits
 		public override object Create(ActorInitializer init) { return new AttackFollow(init.Self, this); }
 	}
 
-	public class AttackFollow : AttackBase, ITick, INotifyOwnerChanged, ISync
+	public class AttackFollow : AttackBase, ITick, INotifyOwnerChanged
 	{
 		public Target Target { get; protected set; }