Don't recurse into closed modules/sections in split_lib.

Putting `assert false` in the successful recursive case
never triggered. Apparently all users use `split_lib_at_opening`
to find open at current nesting level? `split_lib` appears to
be dead code currently, might also be candidate for removal.
Doing so would allow to simplify `split_lib_gen`, since we only
expect one matching element.

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