modules/sparkler: plug longstanding chunker leak

Once upon a time this thing asserted the pinned chunks were
empty, and that code is still sitting there commented out.  But
when it was commented out ages ago, to enable bulk freeing of
chunkers without requiring unrefs of every allocation as an
optimization, no code was added to free the pinned chunks.

It's been easily ignored all this time since nobody really runs
rototiller long enough to notice, but that's becoming less true
now with how interesting something like:

--module=rtv,layers=compose,duration=1,context_duration=1,snow_module=none

is becoming...

There are other leaks still, largely surrounding settings, but
they are quite small.  Eventually those will get tidied up as
well.

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