Remove trailing / in MASTERDIR


git-svn-id: svn+ssh://svn.freebsd.org/ports/head@370629 35697150-7ecd-e111-bb59-0022644237b5
www/drupal7: 7.28 -> 7.31

Changes:
https://www.drupal.org/drupal-7.29-release-notes
https://www.drupal.org/drupal-7.30-release-notes
https://www.drupal.org/drupal-7.31-release-notes

PR:		192099
Submitted by:	simon.wright@gmx.net
Approved by:	miwi (timeout)


git-svn-id: svn+ssh://svn.freebsd.org/ports/head@370630 35697150-7ecd-e111-bb59-0022644237b5