fix: MPRIS loop tokio::select!() panic on exit

This fixes a bug that would cause a panic when quiting the process
normally. `tokio::select!()` was used to await a single branch, which is
useless as it can be replaced by a normal await.

src/mpris.rs

@@ -513,15 +513,12 @@ impl MprisManager {
         let player_iface = player_iface_ref.get().await;
 
         loop {
-            tokio::select! {
+            rx.next().await;
-                Some(()) = rx.next() => {
             let ctx = player_iface_ref.signal_context();
             player_iface.playback_status_changed(ctx).await?;
             player_iface.metadata_changed(ctx).await?;
         }
     }
-        }
-    }
 
     pub fn update(&self) {
         if let Err(e) = self.tx.send(()) {