craklib:fix testnum and teststr failed

craklib:fix testnum and teststr failed

Error log:
...
$ ./testnum
(null).pwd.gz: No such file or directory
PWOpen: No such file or directory

$ ./util/teststr
(null).pwd.gz: No such file or directory
PWOpen: No such file or directory
...

Set DEFAULT_CRACKLIB_DICT as the path of  PWOpen

(From OE-Core rev: 9c78d2ef5291b29fa313f9d4bf6a81c395207d69)

Signed-off-by: Hongxu Jia <hongxu.jia@windriver.com>
Signed-off-by: Saul Wold <sgw@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>