modules/{compose,rtv}: s/prepare_frame/render_fragment/

These modules have been doing their work in prepare_frame(), but
aren't actually threaded modules and don't return a frame plan
from prepare_frame() nor do they provide a render_fragment() to
complement the prepare_frame().

The convention thus far has been that single-threaded modules
just provide a render_fragment and by not providing a
prepare_frame they will be executed serially.

These two modules break the contract in a sense by using
prepare_frame() without following up with render_fragment().

I'm not sure why it happened that way, maybe at one time
prepare_frame() had access to some things that render_fragment()
didn't.

In any case, just make these use render_fragment() like any other
simple non-threaded module would.

This was actually causing a crash when n_cpus=1 because
module_render_fragment() was assuming the prepare_frame() branch
would include a render_fragment().  It should probably be
asserting as such.

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