Update _widgets.scss

updated .cc-widget-subtitle to fit closer to the design spec
Update calcentral.scss

removed $cc-color-widget-highlight-background as it wasn't really needed
Merge branch 'master' into CLC-2265
Update _widgets.scss

per CLC-2266, we also want to lighten the background color a bit
Merge pull request #1348 from jonmhays/CLC-2265

CLC-2265 My Classes subtitles don't match the design spec