Portfolio manager invite updates:

- Update the form to use BooleanFields for the permissions and make the
form more similar to the Application Members form
- Use MemberFormTemplate macro in the portfolio settings template
- fix tests affected by the form changes

templates/applications/fragments/members.html

@@ -185,6 +185,7 @@
             modal=new_member_modal_name,
           ),
           member_form.SubmitStep(
+            name=new_member_modal_name,
             form=member_fields.PermsFields(form=new_member_form, new=True),
             submit_text="portfolios.applications.members.form.add_member"|translate,
             modal=new_member_modal_name,