generic/773: fix expected output "QA output created by 1226"

The test generic/773 was apparently submitted as generic/1226, but
when it was renamed to pack the test namespace, apparently the test
output wasn't adjusted to reflect the new test name, leading to the
test failing on sytems that have devices that support atomic writes.

Fixes: 1499d4ff2365 ("generic: Add atomic write test using fio crc ...")
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Reviewed-by: Ojaswin Mujoo <ojaswin@linux.ibm.com>
Reviewed-by: Zorro Lang <zlang@redhat.com>
Signed-off-by: Zorro Lang <zlang@kernel.org>