viewBox calculation mixed up

[florianfesti]

Hi!
I get users complaining that the SVGs I generate with Boxes.py (https://github.com/florianfesti/boxes) cannot be rendered with Laserweb. A quick look into the code raised the suspicion that the viewBox calculation may be off. Especially those two lines in tagparser.js seem to be in the wrong order. Swapping them out at least shows something:

this.tag.scale(scaleX, scaleY)
this.tag.translate(-translateX, -translateY)

Test with any SVG with has a viewBox not starting at 0 0 - like all Boxes.py artifacts.

Sorry, for not submitting a proper PR.

[florianfesti]

Is a PR going to help with this or should it be filed directly against LaserWeb4?