Bug#592375: update-grub not called anymore

[Cesare Leonardi]

Sorry for not noting that zz-update-grub belongs to grub-legacy.
The version i'm using is 0.97-62.

In the zz-update-grub script there's a problem with some arguments 
between single quotes that makes unmatch the case condition.
The attached patch solves the problem.

Ciao.

Cesare.
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