js: Revert mod-to-bitwise-and peephole optimization.
js: Revert mod-to-bitwise-and peephole optimization.

Turns out you get negative numbers from rng with that.

This reverts commit 2b6f22d27951bf044b13099582ac521ba70abdc4.

ncph/ncph3,ncph/ncph3,ncph/ncph3,ncph/ncph3