chromeos: Disable one more failing crostini Tast test.

Like crrev.com/c/2386599, but adds one more that was missed on
accident.

Bug: 1123300
Change-Id: I0b97c17eb77eab08f45009147183c7ea528ef328
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2388340
Auto-Submit: Ben Pastene <bpastene@chromium.org>
Commit-Queue: Alex Newcomer <newcomer@chromium.org>
Commit-Queue: Ramya Nagarajan <ramyan@chromium.org>
Reviewed-by: Alex Newcomer <newcomer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#803558}

chromeos/BUILD.gn

@@ -295,6 +295,7 @@ if (is_chromeos_device) {
       "crostini.Basic.artifact",
       "crostini.PackageInfo.artifact",
       "crostini.PackageInstallUninstall.artifact",
+      "crostini.Sanity.artifact",
       "crostini.SecureCopyPaste.copy_wayland_artifact",
       "crostini.SecureCopyPaste.copy_x11_artifact",
       "crostini.SecureCopyPaste.paste_wayland_artifact",