[wpt] Un-sub css-values/urls HTML files with no substitutions

I realized some tests I added don't actually have any substitutions in
them, and it turns out there are many others like that marked as .sub.

Unmark them.

Bug: 435625756
Change-Id: Ib5cb502f4f82f225e9619bac66849c04bd395554
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/7758777
Commit-Queue: jj <jj@chromium.org>
Reviewed-by: Fredrik Söderquist <fs@opera.com>
Cr-Commit-Position: refs/heads/main@{#1615120}

Author: dumbmoron