Customizer: Fix header content not showing when the header image is being disabled and header text turned on.
Set default values for all theme settings.
Bizarre bug fix: Remove hybrid_get_setting() from the Color Palette callback

The function call to hybrid_get_setting() caused the "Show slider"
checkbox in the Theme Customizer not to function correctly
(!?!?##¤#"!@??!!?). How are they even remotely related!?!?

Had the record it: http://www.screenr.com/320H

Long live git bisect!!