Suppress flaky wpt callback-cross-realm-report-exception.html test

This change will suppress a known flaky wpt test.

external/wpt/intersection-observer/callback-cross-realm-report-exception.html
was suppressed only for Mac with CL:5441433 and also already had its
virtual counterpart suppressed with CL:5235140.

In order to suppress this test for all platforms, the line that
suppresses the test just for Mac needed to be removed, and the line
that was suppressing just the virtual test was updated.

This test is flaky both in Chromium and in Edge:
https://ci.chromium.org/ui/test/chromium/ninja%3A%2F%2F%3Ablink_wpt_tests%2Fexternal%2Fwpt%2Fintersection-observer%2Fcallback-cross-realm-report-exception.html

Bug: 1521474
Change-Id: Iac20600d7bf134f836067b47943262cf68d1f8b7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5606070


Commit-Queue: Evelynn Kaplan <evelynn.kaplan@microsoft.com>
Reviewed-by: Alison Maher <almaher@microsoft.com>
Reviewed-by: Stefan Zager <szager@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1312905}