Merge: inkscape_tools: fix Inkscape version detection on Ubuntu

The regex detecting the Inkscape version was too permissive and expected 3 numbers. This made it wrongly match the revision string on Ubuntu where the version string has only 2 numbers:
`Inkscape 0.91 r13725`

Thanks @BlackMinou!

Pull-Request: #2616
Reviewed-by: Romain Chanoir <romain.chanoir@viacesi.fr>