Fix for disappearing status bar power widgets after changing T-Mo themes.

Patch Set 2: After all the problems getting system UI to re-initialize properly, the
new approach is to kill and restart the process.  More drastic, but it'll certainly
make sure there are no artifacts or leaks from the old theme.

Change-Id: I116db9d92d002d4bf3c03e1d7cef5b0e102e3fd6