Update test env vars

Author: wildjames

packages/updatePrescriptionStatus/.jest/setEnvVars.js

@@ -1,6 +1,7 @@
 /* eslint-disable no-undef */
 process.env.NHS_NOTIFY_PRESCRIPTIONS_SQS_QUEUE_URL = "dummy_notify_sqs";
 process.env.POST_DATED_PRESCRIPTIONS_SQS_QUEUE_URL = "dummy_postdated_sqs";
+process.env.ENABLE_POST_DATED_NOTIFICATIONS = "true";
 process.env.AWS_REGION = "eu-west-2";
 process.env.SQS_SALT = "the quick brown fox something something"
 process.env.ENABLED_SITE_ODS_CODES_PARAM = "ENABLED_SITE_ODS_CODES_PARAM"