Fix flickering in debug panel

This flickering made debug panel unusable, because most of the time
panel was white. This problem effects wxPython with GTK3+ backend
(at least on GNU/Linux systems).

Removed code IIUC draws box with content of moved debug variable, I
don't see any effect of it neither on GNU/Linux nor on Windows. It
should be safe to remove.

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{

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    "url":"ws://127.0.0.1:8888",

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    "realm":"Automation",

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    "ID":"wamptest",

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    "password":"1234567890",

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    "key":"ABCDEFGHIJ"

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}