fix: forc-wallet balance command panics after clap v4 update (#126)

closes #122.

This was a breaking change, in clap.
[Here](clap-rs/clap#4306) is a discussion
in clap's repo for the solution.

Author: kayagokalp

src/balance.rs

@@ -18,6 +18,7 @@ use crate::{
 };
 
 #[derive(Debug, Args)]
+#[group(skip)]
 pub struct Balance {
     // Account-specific args.
     #[clap(flatten)]