[TxMt] Patch to fix missing completion of listing labels

[Mark Eli Kalderon]

> Because the labels of listings in LaTeX are given as
>
> \lstset{what=ever, label=Woohoo, something=other}
>
> the label_scan method in LaTeXUtils.rb doesn't pick up the labels at  
> all. The attached patch will hopefully fix this issue properly.
>
> --Thomas

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