Change Details

The spec says it must be called with a details callback [1] [1] https://w3c.github.io/mediasession/#callbackdef-mediasessionactionhandler

The spec says it must be called with a details dict [1] [1] https://w3c.github.io/mediasession/#callbackdef-mediasessionactionhandler

The spec says it must be called with a details callback [1dict [1] [1] https://w3c.github.io/mediasession/#callbackdef-mediasessionactionhandler