tests: don't chmod 777 everything upon cleanup
tests: don't chmod 777 everything upon cleanup

rm -rf works just fine no matter what mode bits are set (modulo
file ownership and current user id). Test 43 creates a symlink
to / and the chmod operation would change file permissions outside
of the test directory.

veritas-shine/minix3-rpi,veritas-shine/minix3-rpi,veritas-shine/minix3-rpi,veritas-shine/minix3-rpi,veritas-shine/minix3-rpi,veritas-shine/minix3-rpi,veritas-shine/minix3-rpi,veritas-shine/minix3-rpi