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/collab/src/db/queries/buffers.rs

@@ -391,7 +391,7 @@ impl Database {
         drop(rows);
 
         if collaborators.is_empty() {
-            self.snapshot_channel_buffer(channel_id, &tx).await?;
+            self.snapshot_channel_buffer(channel_id, tx).await?;
         }
 
         Ok(LeftChannelBuffer {