Make Alarm popup Gingerbread style

It seems Google forgot to update the drawables for the DeskClock app.
The result is that the popup has the old Froyo (and earlier) look. See
the screenshots below.

Before: http://imgur.com/a/dWh4h#Sxjlc

Change-Id: I70506d15f27ebbb6dae8ed198ddd5ff9600368d0
After: http://imgur.com/a/dWh4h#4pQWi