Revert script/database_exists to fallback behavior
Prior to e61190f6, the database_exists script did not require e.g. `MAINTENANCE` to be defined if `READWRITE` was (because `get` with `MAINTENANCE` falls back to `READWRITE`). There was no real reason to change this script to use the new `exists` method over `get`, and in fact some scripts in musicbrainz-docker rely on the old behavior, so I'm reverting the change.
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