Additional new nightly lint fixes.

Signed-off-by: Jason Volk <jason@zemos.net>

src/admin/room/moderation.rs

@@ -233,6 +233,6 @@ async fn list_banned_rooms(&self, no_details: bool) -> Result {
 		.collect::<Vec<_>>()
 		.join("\n");
 
-	self.write_str(&format!("Rooms Banned ({num}):\n```\n{body}\n```",))
+	self.write_str(&format!("Rooms Banned ({num}):\n```\n{body}\n```"))
 		.await
 }