Write correct sBIT for 10-bit BGRA

Theoretically, some decoders might decide to drop bits otherwise.

Bug: 431746508
Change-Id: I49cb6e1688368b67c1faa213ba91d124a4cdd584
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/1019757
Reviewed-by: Daniel Dilan <danieldilan@google.com>
Reviewed-by: Florin Malita <fmalita@google.com>
Commit-Queue: Alec Mouri <alecmouri@google.com>
1 file changed