Fix overridability of LP_COLOR_X11_{ON,OFF} from themes
Fix overridability of LP_COLOR_X11_{ON,OFF} from themes

This was broken since LP_COLOR_X11 has been split.
(Commit 452ef223cea64ab8be27b7a273bd18dd4f4bcb36)

laurentbardin/liquidprompt,smadhueagle/liquidprompt,tstone2077/liquidprompt,illwieckz/liquidprompt,dan-cleinmark/liquidprompt,pkkolos/liquidprompt,dpilone/liquidprompt,dtschan/liquidprompt,joshuarubin/dotfiles,nojhan/liquidprompt,milouse/liquidprompt,joshuarubin/dotfiles,tsbarnes/liquidprompt,joshuarubin/dotfiles,BobHood/liquidprompt,alexprengere/liquidprompt,jaesivsm/liquidprompt,joshuarubin/dotfiles,kenrachynski/liquidprompt