Turn ZeroTouchForcedAttestationFail back on.

With preparation status as true by default in fake attestation client
this test item doesn't suffer from repeationg loop and can pass now.

Bug: 1107426
Change-Id: I12ccbbb323f530c19c5dc60d046af613758a3a58
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2308626Reviewed-by: Maksim Ivanov <emaxx@chromium.org>
Commit-Queue: Leo Lai <cylai@google.com>
Cr-Commit-Position: refs/heads/master@{#790360}

chrome/browser/chromeos/login/enrollment/enrollment_local_policy_server_browsertest.cc

@@ -741,8 +741,7 @@ IN_PROC_BROWSER_TEST_F(InitialEnrollmentTest, EnrollmentForced) {
 
 // Zero touch with attestation authentication fail. Attestation fails because we
 // send empty cert request. Should switch to interactive authentication.
-IN_PROC_BROWSER_TEST_F(InitialEnrollmentTest,
-                       DISABLED_ZeroTouchForcedAttestationFail) {
+IN_PROC_BROWSER_TEST_F(InitialEnrollmentTest, ZeroTouchForcedAttestationFail) {
   auto initial_enrollment =
       enterprise_management::DeviceInitialEnrollmentStateResponse::
           INITIAL_ENROLLMENT_MODE_ZERO_TOUCH_ENFORCED;