Bug 30418: Re-order options of who can edit list contents

Bug 30418: Re-order options of who can edit list contents

The 'Allow changes to contents from' dropdown when creating/edit lists
should be most locked down to least locked down:

1. Nobody
2. Owner only
3. Permitted staff only
4. Staff only
5. Anyone seeing this list

Sponsored-by: Catalyst IT, New Zealand
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Lucas Gass <lucas@bywatersolutions.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>