Hack to update status bar service drawables on theme change.

The status bar UI is running in a service which doesn't have the typical
activity lifecycle to trigger a View reinflation that is normally used
to apply a theme.  Manual reinflation is tricky for the status bar
because of hacks in the PhoneWindowManager which attach to the initial
status bar view added to it (it apparently cannot be removed in a stable
fashion).  More research is needed to solve this issue properly.