Fix the 'emits NETWORK_REQUEST_QUEUE_SIZE when a request is removed' test
Fix the 'emits NETWORK_REQUEST_QUEUE_SIZE when a request is removed' test

This needs to call `fulfillRequest` on a pending request, not on a request
that isn't even in-flight.

tulios/kafkajs,tulios/kafkajs,tulios/kafkajs,tulios/kafkajs