[FIX] res_config_settings: all users can see "module" fields (possibly readonly)
[FIX] res_config_settings: all users can see "module" fields (possibly readonly)

This fixes an error message preventing a non-system-manager user to edit
settings.

ygol/odoo,laslabs/odoo,sysadminmatmoz/OCB,sysadminmatmoz/OCB,dfang/odoo,storm-computers/odoo,storm-computers/odoo,sysadminmatmoz/OCB,hip-odoo/odoo,bplancher/odoo,Elico-Corp/odoo_OCB,microcom/odoo,storm-computers/odoo,Elico-Corp/odoo_OCB,storm-computers/odoo,microcom/odoo,syci/OCB,Elico-Corp/odoo_OCB,ygol/odoo,storm-computers/odoo,stephen144/odoo,sysadminmatmoz/OCB,ygol/odoo,stephen144/odoo,optima-ict/odoo,bplancher/odoo,Elico-Corp/odoo_OCB,laslabs/odoo,optima-ict/odoo,optima-ict/odoo,bplancher/odoo,sysadminmatmoz/OCB,microcom/odoo,storm-computers/odoo,ygol/odoo,hip-odoo/odoo,microcom/odoo,optima-ict/odoo,Elico-Corp/odoo_OCB,laslabs/odoo,microcom/odoo,hip-odoo/odoo,ygol/odoo,syci/OCB,syci/OCB,stephen144/odoo,laslabs/odoo,syci/OCB,stephen144/odoo,dfang/odoo,sysadminmatmoz/OCB,hip-odoo/odoo,syci/OCB,dfang/odoo,bplancher/odoo,hip-odoo/odoo,ygol/odoo,bplancher/odoo,microcom/odoo,stephen144/odoo,Elico-Corp/odoo_OCB,dfang/odoo,sysadminmatmoz/OCB,syci/OCB,ygol/odoo,hip-odoo/odoo,laslabs/odoo,stephen144/odoo,optima-ict/odoo,laslabs/odoo,optima-ict/odoo,dfang/odoo,bplancher/odoo,dfang/odoo