PPPoE Scan 字符大小写错误

[cmmchina]

英文不好，反应一个关于PPPoE Scan，字符在mac下不准的问题，windows下的winbox是正确的，大小写错误导致了填写ac的时候不准确。

Checklist

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• I made sure this is not the original Winbox issue.

Describe the bug
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To Reproduce
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2. Click on '....'
   
   

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4. See error

Expected behavior
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Desktop (please complete the following information):

• macOS version: [e.g. 10.14.5]
• macOS language [e.g. English, Russian, Chinese]
• Winbox-mac version [e.g. 3.18]
• Winbox version [e.g. 3.18]

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