Had an extra "gl_cts" appended.

Bug: angleproject:3353
Change-Id: I962cd0196b898e5fdd631790d88bfb1d478d16b9
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1630292Reviewed-by: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Yuly Novikov <ynovikov@chromium.org>
Commit-Queue: Jamie Madill <jmadill@chromium.org>