Remove VizDisplayCompositor from test args

The VizDisplayCompositor feature is no longer checked so it can be
removed from the test command line arguments.

Bug: 936425
Change-Id: I2eab4f68664de40c87f0aa8e696f6117d4f4e1ea
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1992622
Auto-Submit: kylechar <kylechar@chromium.org>
Reviewed-by: Yuly Novikov <ynovikov@chromium.org>
Commit-Queue: kylechar <kylechar@chromium.org>
Cr-Commit-Position: refs/heads/master@{#729749}