[IMP] hr: first employee should be admin user

Hello ,

I have improved the first employee shouldn't be hardcoded "Administrator" but should be = to the first user name (admin user).

More details:
Task link :- https://openerp.my.openerp.com/web#id=7038&view_type=form&model=project.task&menu_id=3942&action=327
Pad link :- https://pad.odoo.com/p/r.u344U93tJzXKvnQ7
Thanks,
Sunil Sharma (ssh-odoo)

This will crash if you delete the first employee