Prevent invalid user management actions

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This PR:

• Fixes prevent of self-removal from a team (type coercion error)
• Requires more than 1 moderator to demote own moderator status

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Name	Status	Preview	Comments	Updated
osm-teams	✅ Ready (Inspect)	Visit Preview	💬 Add your feedback	Mar 14, 2023 at 8:55PM (UTC)

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Superseded by #415 - including the same changes