Fix ParseConfigs_ViaParsing test when skia_angle=1

The handling of angle-gl changes with SK_ANGLE. We don't have any bots
that test this particular combination, but I see it all the time while
running DM for other things.

Previously considered changing things so that the config parsing results
are consistent, regardless of GYP_DEFINES, but this is much simpler (and
more consistent with the other code we already have for testing config
parsing).

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2183323004

Review-Url: https://codereview.chromium.org/2183323004
1 file changed