checkplot: turn off the green highlight for best phased LCs by default
checkplot: turn off the green highlight for best phased LCs by default

this is only for the checkplot_pickle associated function. we plan to
use background highlights in the checkplotserver UI for user-generated
plots, i.e. redos of periodograms or phased LCs.  these will be used to
distinguish them from existing plots on the page.


Former-commit-id: bfb24d45c974011ed510a5766be21c9cbc63ac68
lgbouma/astrobase,waqasbhatti/astrobase,waqasbhatti/astrobase,waqasbhatti/astrobase,lgbouma/astrobase,lgbouma/astrobase