Re-enable testRecreateSpareRendererOnTabClose

I believe the flakiness was fixed with
https://issues.chromium.org/issues/344898996

Bug: 340944114
Change-Id: I5eb8d830185955fd6d38f8d1db5ee774c6b66dc3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5616670


Reviewed-by: Yaron Friedman <yfriedman@chromium.org>
Commit-Queue: Michael Thiessen <mthiesse@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1313016}