NOISE_BT randomState is Infinity; causes NaN values in decoded data

[phoboslab]

This line causes randomState to be Infinity after a few iterations.

this.randomState *= 1664525 + 1013904223;

~ https://github.com/audiocogs/aac.js/blob/master/src/ics.js#L234

A few lines later these "random" values will be multiplied with a scale factor of -0 (because energy is Infinity as well), resulting in NaN.

Proposed fix, cast it to an integer:

this.randomState = (this.randomState * (1664525 + 1013904223))|0;

[devongovett]

Sounds good, can you make a pull request?