Fix setting of GL texture swizzle when using 1 for swizzle.

Bug: skia:
Change-Id: I96a128fa0bad282ae4566a6cb967d0de459448b1
Reviewed-on: https://skia-review.googlesource.com/c/193467
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Greg Daniel <egdaniel@google.com>
1 file changed