Prevent session from starting during WordPress pseudo cron procedures

The wp-cron.php route triggers warnings:

[18-Jul-2020 05:54:32 UTC] PHP Warning:  session_start(): Cannot start session when headers already sent in /path/to/wp-content/plugins/civicrm/civicrm.php on line 371

There's no need to start the session when running WordPress pseudo-cron.

Related issue in Core.

PR here: https://github.com/civicrm/civicrm-wordpress/pull/210/files

Edited Jul 18, 2020 by haystack

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