Also re-enable the Windows AMD tests that were suppressed because of
that bug.

Bug: angleproject:2492

Change-Id: Ie9b5eb4c5705bbb390c3899fe4c66d3e47eff00d
Reviewed-on: https://chromium-review.googlesource.com/1026461
Commit-Queue: Luc Ferron <lucferron@chromium.org>
Reviewed-by: Jamie Madill <jmadill@chromium.org>