check_ethernet.hook: Fix broken path

https://crrev.com/c/2971327 changed the path to the wifi_cred
file make the same change here.

BUG=b:191365317
TEST=None

Change-Id: I76c1b63a6069709bd7770bd143faf3cb4002503e
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crostestutils/+/2992057
Tested-by: Keith Haddow <haddowk@chromium.org>
Auto-Submit: Keith Haddow <haddowk@chromium.org>
Reviewed-by: Grant Grundler <grundler@chromium.org>
Commit-Queue: Keith Haddow <haddowk@chromium.org>
1 file changed