[Toybox] [PATCH] tar.test: workaround for mksh.

[enh]

mksh behaves differently for `VAR=val x` depending on whether x is a
command/builtin or a function.

Commands:

  crosshatch:/ # POOP=1 date
  Mon Apr 29 20:33:19 GMT 2019
  crosshatch:/ # echo $POOP

Builtins:

  crosshatch:/ # POOP=1 echo $POOP

  crosshatch:/ # echo $POOP

Functions:

  crosshatch:/ # function poop()
  > {
  > echo $POOP
  > }
  crosshatch:/ # poop

  crosshatch:/ # POOP=1 poop
  1
  crosshatch:/ # echo $POOP
  1
  crosshatch:/ #

This causes all tar tests following the one that uses LSTARG to fail.
Switch to making LST take an argument instead, since there's only one
special caller.
---
 tests/tar.test | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)
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