Re-enable a couple of WebAssembly tests previously disabled by mistake.

Change-Id: I315b991bc1bb2a22aa5238e85e477704e3dc94df
Bug: 
Reviewed-on: https://chromium-review.googlesource.com/543123Reviewed-by: Bill Budge <bbudge@chromium.org>
Commit-Queue: Martyn Capewell <martyn.capewell@arm.com>
Cr-Commit-Position: refs/heads/master@{#46132}