Deletes a brand. Anything the brand was applied to falls back to the
account-level default brand, unless sync_to_customizations is set, in
which case the brand's values are written into each item's own
customizations first so they keep their current look.

The account-level default brand (is_default: true) can't be deleted.

Requires api token with one of the following permissions

All data

Tokens with the "Act with a team member's permissions" permission
(all:delegate_to_contact_permissions scope) can also be used. Requests
made with such a token are authorized using the permissions of the
contact assigned to the token.