Fix another problem with procstats bucketing.

We were now propagating the screen on state when updating
all process states, so they would get pushed into the screen
off bucket always even if the screen was on.  Oops!

Also improve the summary output when dumping a single package
to be more summary-like.

Change-Id: I16c640f9dc02d6db8c66aeb1c720f67beab60635