Search not working on the selectionprompt if you have [] characters in your string.

[flupkede]

Describe the bug
Adding [] characters in the string you add to the selectionprompt choices results in an error on invoking the search in the UI:
System.InvalidOperationException: 'Encountered malformed markup tag at position 4.'

To Reproduce
var testprompt = new SelectionPrompt() { SearchEnabled = true }
.Title("Test Search");
testprompt.AddChoice("[[01]] My first item");
testprompt.AddChoice("[[02]] My second item");
var result = _con.Prompt(testprompt);

Run the code and try to type in the search input.

Expected behavior
Search should work without formatting

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