(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
  - and also remove thed `if(qa){`...`}` parts
    - this was the part that had `require` statements, so now webpack
      etc should be able to parse it without a problem
      - there was a `require("fs")` and a `require("path")` in there
  - alternatively, could build and replace stuff with webpack, but I'd
    need to provide that anyway for auto-config
    - downside is it might no longer work on Node, but not the target
      audience so w/e

Author: agilgur5