Make sure actors are removed from control groups when captured

Fixes #5976.

OpenRA.Game/Selection.cs

@@ -65,7 +65,7 @@ namespace OpenRA
 
 			foreach (var cg in controlGroups.Values)
 				// note: NOT `!a.IsInWorld`, since that would remove things that are in transports.
-				cg.RemoveAll(a => a.Destroyed);
+				cg.RemoveAll(a => a.Destroyed || a.Owner != world.LocalPlayer);
 		}
 
 		Cache<int, List<Actor>> controlGroups = new Cache<int, List<Actor>>(_ => new List<Actor>());