MAINTAINERS: adjust entries in FORTIFY_SOURCE and KERNEL HARDENING

MAINTAINERS: adjust entries in FORTIFY_SOURCE and KERNEL HARDENING

Commit db6fe4d61ece ("lib: Move KUnit tests into tests/ subdirectory") adds
a file entry to the non-existing file scripts/test_fortify.sh. Probably,
this entry intends to refer to ./lib/test_fortify/test_fortify.sh, though.
As that file is already covered by the entry lib/test_fortify/*, there is
no need for a separate file entry. So, drop the unnecessary file entry to
the test_fortify script.

Further, this commit misses to adjust the entry referring to
lib/usercopy_kunit.c, which is moved to lib/tests. So, also adjust that
file entry.

Fixes: db6fe4d61ece ("lib: Move KUnit tests into tests/ subdirectory")
Signed-off-by: Lukas Bulwahn <lukas.bulwahn@redhat.com>
Link: https://lore.kernel.org/r/20250217100643.20182-1-lukas.bulwahn@redhat.com
Signed-off-by: Kees Cook <kees@kernel.org>