fix: register session with addSession() to activate Media3 notifications

MediaSessionService only sets up its internal MediaNotificationManager
when addSession() is called. This normally happens when a MediaController
binds, but since we use custom intents, no controller ever connected.
Calling addSession() after session creation activates the notification
pipeline. Also removed debug logging.

Made-with: Cursor

app/src/main/java/xyz/cottongin/radio247/service/RadioPlayerAdapter.kt

@@ -41,7 +41,6 @@ class RadioPlayerAdapter(
         } else {
             emptyList()
         }
-
         return SimpleBasePlayer.State.Builder()
             .setAvailableCommands(commands)
             .setPlaybackState(_playbackState)