“A party attorns to a court’s jurisdiction when it goes beyond simply challenging the jurisdiction of that court and, instead, litigates a claim on the merits: see Van Damme v. Gelber, 2013 ONCA 388 (CanLII), 115 O.R. (3d) 470, at paras. 3, 24, leave to appeal refused, [2013] S.C.C.A. No. 342; and Wolfe v. Wyeth, 2011 ONCA 374 (CanLII), 282 O.A.C. 64, at para. 44.”