Fix alignment of ASCII box in stake CLI method

[aesedepece]

You can see here what I mean:

║ 4. STAKE AMOUNT                                                              ║
║    This is the number of coins that will be staked. While staked, the coins  ║
║    cannot be transferred or spent. They can only be unstaked and eventually  ║
║    spent by the withdrawer address above.                                    ║
║                                                                              ║
║    Stake amount: 10.000000000 Wit coins                                   ║
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