chore: Fix several style lints (#17488)

It's not comprehensive enough to start linting on `style` group, but
hey, it's a start.

Release Notes:

- N/A

crates/audio/src/assets.rs

@@ -44,7 +44,7 @@ impl SoundRegistry {
         let bytes = self
             .assets
             .load(&path)?
-            .map(|asset| Ok(asset))
+            .map(Ok)
             .unwrap_or_else(|| Err(anyhow::anyhow!("No such asset available")))?
             .into_owned();
         let cursor = Cursor::new(bytes);

crates/audio/src/audio.rs

@@ -33,6 +33,7 @@ impl Sound {
     }
 }
 
+#[derive(Default)]
 pub struct Audio {
     _output_stream: Option<OutputStream>,
     output_handle: Option<OutputStreamHandle>,
@@ -45,10 +46,7 @@ impl Global for GlobalAudio {}
 
 impl Audio {
     pub fn new() -> Self {
-        Self {
-            _output_stream: None,
-            output_handle: None,
-        }
+        Self::default()
     }
 
     fn ensure_output_exists(&mut self) -> Option<&OutputStreamHandle> {