fix(subscription): remove redundant pangea_user_id from payment_link request (#5856)

The server derives user identity from the Matrix Bearer token already
sent in the Authorization header. The pangea_user_id query param is
ignored server-side and unnecessary.

Co-authored-by: ggurdin <ggurdin@gmail.com>
Co-authored-by: ggurdin <46800240+ggurdin@users.noreply.github.com>

lib/pangea/subscription/controllers/subscription_controller.dart

@@ -293,7 +293,7 @@ class SubscriptionController with ChangeNotifier {
       accessToken: _pangeaController.userController.accessToken,
     );
     final String reqUrl = Uri.encodeFull(
-      "${PApiUrls.paymentLink}?pangea_user_id=$_userID&duration=${duration.value}&redeem=$isPromo",
+      "${PApiUrls.paymentLink}?duration=${duration.value}&redeem=$isPromo",
     );
     final Response res = await req.get(url: reqUrl);
     final json = jsonDecode(res.body);