Spotify: config conflict with normalization and external volume control

[volumio]

there is a config file problem where normalisation pregain and external volume the yaml config file for the go-librespot daemon don’t get properly replaced and their placeholders stay there, causing the librespot daemon to be unable to start due the messed up config.yml, i fixed this by removing the placeholders in the yml tmp file in the plugins folder and replacing them with static values but that’s not really something i should need to do