minor hsl fixes in web example

this tweak fixes a couple issues I was having:
- Buffer.writeUInt16LE() was throwing out-of-bounds error when it encounters fractional  hsl values. 
- I think maybe the intent was to cap saturation at 80%, but instead it was being scaled to 120% (causing overflow).
Merge remote-tracking branch 'remotes/patch/patch-1'
Merge branch 'master' into alarm-clock