mm/damon/Kconfig: update DBGFS_KUNIT prompt copy for SYSFS_KUNIT

mm/damon/Kconfig: update DBGFS_KUNIT prompt copy for SYSFS_KUNIT

CONFIG_DAMON_SYSFS_KUNIT_TEST prompt is copied from that for DAMON debugfs
interface kunit tests, and not correctly updated.  Fix it.

Link: https://lkml.kernel.org/r/20241028233058.283381-6-sj@kernel.org
Fixes: b8ee5575f763 ("mm/damon/sysfs-test: add a unit test for damon_sysfs_set_targets()")
Signed-off-by: SeongJae Park <sj@kernel.org>
Cc: Andrew Paniakin <apanyaki@amazon.com>
Cc: Brendan Higgins <brendan.higgins@linux.dev>
Cc: David Gow <davidgow@google.com>
Cc: Shuah Khan <shuah@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>