server: Return real parent and owner in the create_window request.

Remove computing of parent and owner handles on the client side.
diff --git a/server/trace.c b/server/trace.c
index 3e5155a..0d5fac9 100644
--- a/server/trace.c
+++ b/server/trace.c
@@ -2267,6 +2267,8 @@
 static void dump_create_window_reply( const struct create_window_reply *req )
 {
     fprintf( stderr, " handle=%p,", req->handle );
+    fprintf( stderr, " parent=%p,", req->parent );
+    fprintf( stderr, " owner=%p,", req->owner );
     fprintf( stderr, " extra=%d,", req->extra );
     fprintf( stderr, " class_ptr=%p", req->class_ptr );
 }