Fix GrColorType name for half float RG.

Change-Id: I5428be31367fc85fb1fe4f98f4e7536f17c93f10
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/223301
Commit-Queue: Brian Salomon <bsalomon@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
Auto-Submit: Brian Salomon <bsalomon@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
6 files changed