Debugging with multiple isolates involved is fixed now, thus unskip the
test.

R=thibaudm@chromium.org

Bug: v8:10359, v8:10099
Change-Id: I0134fe9da21c86dd40a559dbd4cf8c998a70be20
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2629512Reviewed-by: Thibaud Michaud <thibaudm@chromium.org>
Commit-Queue: Clemens Backes <clemensb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#72099}