[fix] specify HTMLPurifier tmp file location
[fix] specify HTMLPurifier tmp file location

Permissions issues were occuring within the vendor directory for
HTMLPurifier. Set the configuration so it knows to put tmp files into
the CMS tmp directory.

refs: https://mygeohub.org/support/ticket/1332

zweidner/hubzero-cms,zweidner/hubzero-cms,zooley/hubzero-cms,anthonyfuentes/hubzero-cms,anthonyfuentes/hubzero-cms,zooley/hubzero-cms,zooley/hubzero-cms,anthonyfuentes/hubzero-cms,anthonyfuentes/hubzero-cms,zweidner/hubzero-cms,zweidner/hubzero-cms,zooley/hubzero-cms