Fixup [reset] button issue with redactor
Fix focus on redactor boxes in dialog windows

  * Upgrade to Redactor 9.1.7
  * Use a (x) icon from font-awesome for the dialog
Merge pull request #130 from greezybacon/issue/redactor-fixup

Address major Redactor issues

Reviewed-By: Peter Rotich <peter@osticket.com>