Conversions aren't tracked for not logged in users

Hi,
conversions were only tracked for logged in users. Turns out the format for the WHERE clause was missing.

public function update_conversion( $test_id, $user_id ) {
	global $wpdb;

	$wpdb->update(
		$this->table_tracking_name,
		array(
			'converted' => current_time( 'mysql' ),
		),
		array(
			'id' => $test_id,
			'user_id' => $user_id,
		),
		array( '%s'),
		array( '%s', '%s' )
	);
}

If you can reproduce this, please commit the change

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