[intl] Mark date-format/timezone as pass/fail

It succeeds on my machine, at least, so marking pass/fail to avoid
unnecessary noise until the attached bug is resolved.

TBR=machenbach@chromium.org

Bug: v8:6252
Change-Id: I146eee0c464896e42058745096e929d221c04347
Reviewed-on: https://chromium-review.googlesource.com/480988Reviewed-by: Adam Klein <adamk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#44704}

test/intl/intl.status

@@ -31,7 +31,7 @@
   'overrides/caching': [PASS, FAIL],
 
   # BUG(v8:6252).
-  'date-format/timezone': [FAIL],
+  'date-format/timezone': [PASS, FAIL],
 }],  # ALWAYS
 
 ['variant == wasm_traps', {