Update handyCAPSSlider.js

Parsing j+1 is pretty useless. It was already a decimal value, so base 10 was also not very useful.
Changed the code to use j+1 directly.
Still needs testing, I'm on mobile now.
Eliminated the use of the variable rgbString

I've removed the variable rgbString.
Don't think the separation was needed.
Merge pull request #2 from BKer/hexToRgbFix

Update handyCAPSSlider.js hexToRgb function