[FIX]mrp:remove undefined progress field on gantt view

steps to reproduce:
-install the manufacturing app
-install studio
-go to manufacturing > click on the studio icon (top right of the window)
> click views > activate the gantt view

you should see a traceback with the following error
"Invalid field 'progress' on model 'mrp.production'"

mrp_production does not have a progress field => removal of the
property "progress" in the view fixes the issue

opw-2144823

closes odoo/odoo#41182

Signed-off-by: Nans Lefebvre (len) <len@odoo.com>