(fix): slightly modify ammo so it won't try to require stuff

- this is what I was having trouble with when I first created this repo
  - c.f. kripken/ammo.js#109 (comment) ,
    webpack/webpack#7352 ,
    and emscripten-core/emscripten#6542
- can't just upgrade to a new ammo as that might very well break
  physijs, so just make the Node environment check false
  - in this case I changed `var qa="object"===typeof process,` to
    `var qa=false,` in the minified code
    - could also remove the `if(qa){`... parts now, though that'll
      probably get re-minified too and nbd