gdi32: Simplify font->aveWidth sanity-checking to remove possible division by zero.

[Sam Edwards]

See http://www.winehq.org/pipermail/wine-devel/2013-May/099795.html for 
the rationale behind this patch.

This also tries to address Aric's observation of negative AveCharWidth, 
see http://www.winehq.org/pipermail/wine-devel/2013-May/099786.html

It makes the most sense to get rid of this sanity check altogether, but 
until then, this should be a more robust way of doing it.
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