isAppearanceLightStatusBars
Checks if the foreground of the status bar is set to light.
This method always returns false on API <23.
If this value is being set in the theme (via windowLightStatusBar), then the correct value will only be returned once attached to the window.
Once this method is called, modifying `systemUiVisibility` directly to change the appearance is undefined behavior.
Return
true if the foreground is light