[Toybox] [PATCH] tar: fix tvf for sparse extension headers.

[enh]

This doesn't fix xvf, but I've run out of time for now and wanted to
show what I'd found so far.

Bug: 140403724
---
 tests/tar.test   | 2 ++
 toys/posix/tar.c | 9 ++++++---
 2 files changed, 8 insertions(+), 3 deletions(-)
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