Fix `"driver": "otto"` location in keyless-plugin-api.json

[georgeowenasurion]

Moving the "driver": "otto" line of keyless-plugin-api.json to its correct position within the "custom_middleware": {...} block. At present, it is outside this block and thus the plugin fails to execute. By moving it within custom_middleware, the plugin will execute successfully.

[letzya]

@georgeowenasurion thank you for your contribution 🙏