Fix mobile crashes

[Adam314159]

Tsumego puzzles seem to crash some mobile browsers.

https://github.com/waltheri/wgo.js/tree/master/extensions/tsumego

can be a problem of the beta extension (hope not) or my implementation
currently the tsumegos are loaded from external .sgf from the /puzzles directory

or consider using different library for the puzzles.
https://tsumego-hero.com/ seems to use the JGoBoard library for puzzles, but I am not sure how it works. Also like the wgoboard version better. (if I can make it work properly)

[climu]

does the browser console say anything about this crash?

[Adam314159]

Don't know, I am not that far in mobile debugging to even be able to access it :D