chore: make improvements suggested by clippy

src/command/join.rs

@@ -142,7 +142,7 @@ pub async fn handle(state: State, interaction: Interaction) {
         .update_response(
             &interaction.token,
         ).embeds(Some(&[
-            EmbedBuilder::new().title("Joined VC with intent to record").description(&format!("This bot joined {channel_mention} and intends to start recording after a responsible disclosure and consent.")).validate().unwrap().build()
+            EmbedBuilder::new().title("Joined VC with intent to record").description(format!("This bot joined {channel_mention} and intends to start recording after a responsible disclosure and consent.")).validate().unwrap().build()
         ]))
         .await
         .expect("TODO");