delete https://api.lytics.io/api/account/setting/
Delete a custom account setting. Given a key for a setting, delete the custom-value.
Note, since account-settings may have default values, this only deletes the entire value that currently exists.
curl -XDELETE "https://api.lytics.io/api/account/setting/logon_session_days" \
-H 'Authorization: $LIOKEY'