Fix Drupal examples

[tyler36]

This PR updates the Drupal example to prevent an error.

Fixes #36.

[tyler36]

@mglaman Could you give this a try if when you get a chance?

(sorry for the the previous mis-placed post)

[tyler36]

Accidently closed? Not sure how that happened.

Tried the follow options:

Debug

* * * * * IS_DDEV_PROJECT=true /var/www/html/vendor/bin/drush cron | tee -a /var/www/html/cron-log1.txt
* * * * * IS_DDEV_PROJECT=true /var/www/html/vendor/bin/drush cron -v | tee -a /var/www/html/cron-log2.txt
* * * * * IS_DDEV_PROJECT=true /var/www/html/vendor/bin/drush cron |& tee -a /var/www/html/cron-log3.txt
* * * * * IS_DDEV_PROJECT=true /var/www/html/vendor/bin/drush cron -v |& tee -a /var/www/html/cron-log4.txt
* * * * * cd /var/www/html && IS_DDEV_PROJECT=true ./vendor/bin/drush cron | tee -a /var/www/html/cron-log5.txt
* * * * * cd /var/www/html && IS_DDEV_PROJECT=true ./vendor/bin/drush cron |& tee -a /var/www/html/cron-log6.txt
* * * * * cd /var/www/html && IS_DDEV_PROJECT=true ./vendor/bin/drush cron -v | tee -a /var/www/html/cron-log7.txt
* * * * * cd /var/www/html && IS_DDEV_PROJECT=true ./vendor/bin/drush cron -v |& tee -a /var/www/html/cron-log8.txt
*

Resulted in cront-log1.txt, cront-log2.txt, cront-log5.txt, cront-log7.txt files being generated.
So including |& seems to cause the job to fail.

Debug 2

* * * * * IS_DDEV_PROJECT=true /var/www/html/vendor/bin/drush cron |& tee -a /var/www/html/cron-log3.txt

I added a hook_cron to a test module to write to the log. Including |& failed to write to the log.
Changing |& to | and restarting DDEV wrote to the log.