As a portal user, complete some steps within a course
Completing all of them makes the course completion to 100 %
Now, in the backend, unpublish one of these steps
Before this commit, the completion was not taking into account
that a step did not "exist" anymore i.e. has been unpublished,
leading to a completion > 100%
After this commit, we search only for steps that are published
The completion cannot exceed 100%
OPW 2033553
closesodoo/odoo#34800
Signed-off-by: Lucas Perais (lpe) <lpe@odoo.com>