• www/groupoffice: Update from 6.2.51 to 6.2.52

• Pet portlint about USES=

• Changelog:
  • Core: Added GO.form.DateFieldReset field
  • Core: Check cachelisteners after module installation.
  • Core: updated XSS detection so it checks for a space after the tags
  • Email: show Email Selection Template dialog if you have more than 10 Email Template

Approved by: miwi (mentor)
Differential Revision: https://reviews.freebsd.org/D11832