Fix view of projects selection for private share types
Fix view of projects selection for private share types

Use existing css class 'update_members' to get scrollbar for form with
projects selection for private share types.
Without it, form will have height appropriate to list of projects.

jcsp/manila-ui,openstack/manila-ui,openstack/manila-ui,hp-storage/manila-ui,hp-storage/manila-ui,openstack/manila-ui,hp-storage/manila-ui,jcsp/manila-ui,jcsp/manila-ui