This fixes the accessor functions (getters and setters) for WebAssembly
accessor properties to not have 'prototype' properties and not be marked
as constructors.

R=ahaas@chromium.org
TEST=mjsunit/wasm/js-api
BUG=chromium:1027945

Change-Id: I0288f511fee1f99997031b41354ecf7b8629b783
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1943157
Commit-Queue: Michael Starzinger <mstarzinger@chromium.org>
Reviewed-by: Andreas Haas <ahaas@chromium.org>
Cr-Commit-Position: refs/heads/master@{#65265}