test: cleanup/fix SelectedNetworkController specs

packages/queued-request-controller/src/QueuedRequestController.ts

@@ -197,7 +197,7 @@ export class QueuedRequestController extends BaseController<
           ) {
             const origin = path[1];
             this.#flushQueueForOrigin(origin);
-            // When a domain is removed from SelectedNetworkController, its because of revoke permissions.
+            // When a domain is removed from SelectedNetworkController, its because of revoke permissions or the useRequestQueue flag was toggled off.
             // Rather than subscribe to the permissions controller event in addition to the selectedNetworkController ones, we simplify it and just handle remove on this event alone.
             if (op === 'remove' && origin === this.#originOfCurrentBatch) {
               this.#clearPendingConfirmations();