svglength: add missing value in switch.
svglength: add missing value in switch.

wavewave/lasem,wavewave/lasem,janmarthedal/mathml2svg,janmarthedal/mathml2svg,wavewave/lasem,gjtorikian/lasem,janmarthedal/mathml2svg,gjtorikian/lasem,wavewave/lasem,gjtorikian/lasem,gjtorikian/lasem,janmarthedal/mathml2svg