[Toybox] [PATCH] tar: turns out --sparse is also known as -S.

[enh]

Found trying to build the aosp_cf_x86_phone-userdebug target. The good
news is that the targets that I knew were using tar with sparse files
all pass now.
---
 toys/posix/tar.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)
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