fix infinite loop in TextHelpAppendable.makeColumnQueue at width 1

[rootvector2]

makeColumnQueue never terminates when the usable width is 1 because indexOfWrap chops a line without whitespace at limit - 1, which is startPos, and appendList reaches that width (or 0, which throws) for any entry with a line break of at most 8 characters since it sizes the wrap width from the entry rather than the page, so indexOfWrap now always consumes one character and list entries wrap at the configured width; found while reviewing the help wrapping after #437.

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