[unittests] Update PlatformUsesGuardPages test status

The test doesn't fail anymore after it was updated to check platforms
with page size > 4096:

402806e8
("[cppgc][unittests] Only expect guard pages support on 4k platforms.")

R=jkummerow@chromium.org

Bug: v8:11587
Change-Id: I6be93e9561b9db0d0f948c5e12fea6a067eb0a76
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2813538Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Commit-Queue: Thibaud Michaud <thibaudm@chromium.org>
Cr-Commit-Position: refs/heads/master@{#73857}

test/unittests/unittests.status

@@ -35,9 +35,6 @@
   # Test uses fancy signal handling. Needs investigation.
   'MemoryAllocationPermissionsTest.DoTest': [SKIP],
 
-  # cppgc::internal::kGuardPageSize is smaller than kAppleArmPageSize.
-  'PageMemoryRegionTest.PlatformUsesGuardPages': [FAIL],
-
   # Time tick resolution appears to be ~42 microseconds. Tests expect 1 us.
   'TimeTicks.NowResolution': [FAIL],
   'RuntimeCallStatsTest.BasicJavaScript': [SKIP],