btcli w overview should show stake

or at least advise that the balances given are just free (unstaked) balance.

Kat, using SS58, saw her balance on ck 5HEUjwdVCDMhHsVXNrYh2ojQzGBdKVSohQdXhZWQaJFSwqqz as τ2.2999e-05, even though it has ~τ1.5 staked.

At the very least, displaying this in scientific notation is probably not ideal.