Fix styling issues when using the DarkActionBar.

When using the "SeriesGuideLight" theme, the some widgets used in the
`ActionBar` aren't inherited correctly.
Fix the `ActionBar` for the "light" theme.

This change will use to correct `actionBarWidgetTheme` for the
"SeriesGuideLight" theme.
Merge branch 'stylefix' of https://github.com/adneal/SeriesGuide into adneal-stylefix