Remove the name filtering from toolbox ps.

Regular ps doesn't have this, and at least in our tree everyone
seems to actually pipe to grep instead of using this anyway. But
since the switch to a more full-featured ps is going to be a nightmare
anyway, let's dip a toe in the water by removing something we don't plan
on supporting.

Change-Id: Id220ae0cfdad8368341730f643a2bfbaad3c9716