tests: update fuzz after ipv4 mapped ipv6 print change

Update IS-IS fuzz test to match corrected output after change in the
display of IPv4 mapped IPv6 address.

The update was performed using wuschl [1] like this:

$ wuschl rebuild tests/isisd/test_fuzz_isis_tlv
$ gzip -9 tests/isisd/test_fuzz_isis_tlv_tests.h

[1] https://pypi.org/project/wuschl/

Signed-off-by: Louis Scalbert <[email protected]>