WindowSurfaceGLX: Do not send an unused border_pixel to XCreateWindow
WindowSurfaceGLX: Do not send an unused border_pixel to XCreateWindow

This was a typo that never had any effect but it could cause problems in
Debug but in release border_pixel could have contain garbage and cause
an X11 error.

BUG=angleproject:892

Change-Id: Id6dc24c726730d998b419101239b3a43d6675330
Reviewed-on: https://chromium-review.googlesource.com/286251
Reviewed-by: Jamie Madill <7e492b4f1c8458024932de3ba475cbf015424c30@chromium.org>
Tested-by: Corentin Wallez <470c533e86f4f848c98c7e11fffc2d043494a401@chromium.org>

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