When copying the setup of the WebAssembly.Exception constructor to
InstallConditionalFeatures, I forgot to copy some parts.

R=thibaudm@chromium.org

Bug: chromium:1191853
Change-Id: Iacba30b3356fc42b7d97f8c105ef91b776b95eb4
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2786853Reviewed-by: Thibaud Michaud <thibaudm@chromium.org>
Commit-Queue: Andreas Haas <ahaas@chromium.org>
Cr-Commit-Position: refs/heads/master@{#73671}