Fix completion for engine in rdb create

[remyleone]

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Command attempted

$ scw rdb instance create engine=interface conversion: interface {} is *rdb.rdbCreateInstanceRequestCustom, not rdb.rdbCreateInstanceRequestCustominterface conversion: interface {} is *rdb.rdbCreateInstanceRequestCustom, not rdb.rdbCreateInstanceRequestCustominterface conversion: interface {} is *rdb.rdbCreateInstanceRequestCustom, not rdbscwbCreateInstanceRequestCustom

Expected Behavior

Engines should show up

Actual Behavior

We get error messages in the completion

More info