text: Title: Custom colors Graph dashboard doesn't work
  Body: ## Mycodo Issue Report:
    - Specific Mycodo Version: 6.1.2
    - Chromium Version 60.0.3112.89 (Developer Build) Built on Ubuntu 14.04, running on Raspbian 9.4 (32-bit)
   
  #### Problem Description
  Please list: When enabling custom colors in Graph dash the color pickers won't show. Can't select any colors.
  
   
  ### Errors
    - No errors
  
  
  ### Steps to Reproduce the issue:
  How can this issue be reproduced?
   1. Make graph -> save
   2. collapse graph -> tick custom colors -> save
   3. collapse graph -> no colorpicker or input fields
   
  Not a biggie but I thought I bring it to your attention.