WCOS: Remove wp_clear_scheduled_hook as it doesn't work as expected.

Although the cron job is deleted after queuing the email, you can see from the init above that visiting other WP pages immediately re-adds the cron job.

public_html/wp-content/plugins/wordcamp-organizer-survey/includes/debrief-survey/cron.php

@@ -179,7 +179,4 @@ function queue_organizer_survey() {
 	} else {
 		log( 'Email status change to `pending`.', $email_id );
 	}
-
-	// Remove the cron job that queues everything.
-	wp_clear_scheduled_hook( 'wc_organizer_debrief_survey_email' );
 }