git: openjdk/loom: fibers: Remove commented-out lines from test

[duke]

Changeset: af9c8d66
Author:    Ron Pressler <ron.pressler at oracle.com>
Date:      2022-04-27 08:16:52 +0000
URL:       https://git.openjdk.java.net/loom/commit/af9c8d66fc80688ab26c8b4851c6bb8cfb8c833b

Remove commented-out lines from test

! test/jdk/jdk/internal/vm/Continuation/java.base/java/lang/StackWalkerHelper.java