Do not check for another status if user cancelled

Note that we still need the same check within the 'then' clause
since a check might have been started before the user cancels
and the response comes in after cancellation.

Ref ActiveLogin#143

src/ActiveLogin.Authentication.BankId.AspNetCore/Areas/BankIdAuthentication/Views/BankId/_LoginScript.cshtml

@@ -163,6 +163,10 @@
         }
 
         function checkStatus(requestVerificationToken, returnUrl, loginOptions, orderRef) {
+            if (loginIsCancelledByUser) {
+                return;
+            }
+
             postJson(options.bankIdStatusApiUrl, requestVerificationToken,
                 {
                     'orderRef': orderRef,