[FIX] mrp: mrp_workorder uninstall

- Install 'quality_mrp_workorder' without demo data
- Go to the General Settings

A warning is raised regarding the uninstallation of 'mrp_workorder'.

This is due to `_onchange_group_mrp_routings`, which assumes that the
installation of 'mrp_workorder' is only linked to the group
`group_mrp_routings`.

This is incorrect: `group_mrp_routings` might not be activated, but it
might be in the dependencies of another module. Therefore, we change the
logic: if we activate `group_mrp_routings`, we install 'mrp_workorder'.
If we deactivate `group_mrp_routings` we do not uninstall
'mrp_workorder' if it is already installed, since it might be required
by a dependancy.

opw-1970910

closes odoo/odoo#32811

Signed-off-by: Nicolas Martinelli (nim) <nim@odoo.com>