fix indent typo in compat
fix indent typo in compat

simon-weber/Unofficial-Google-Music-API,dvirtz/gmusicapi,simon-weber/gmusicapi,thebigmunch/gmusicapi,peetahzee/Unofficial-Google-Music-API,nvbn/Unofficial-Google-Music-API,tanhaiwang/gmusicapi,TheOpenDevProject/gmusicapi,dvirtz/gmusicapi