Updated the technician module permissions

Technicians will no longer have access to the file module when
using non-native users.

Issue: IWSoftware/ekahau-rtls-playbook#1
Ticket: #5507

Signed-off-by: Nathan Callister <ncallister@iwsoftware.com.au>
Merge branch 'master' of github.com:IWSoftware/webmin-role

Issue: IWSoftware/ekahau-rtls-playbook#1