Fixed BGRA10XR to have padding be 6 *least* significant bits.

This is verified in the more robust integration test: https://github.com/flutter/engine/pull/53320

Bug: skia:https://github.com/flutter/flutter/issues/149946
Change-Id: I57fb34e3cc02db63c3125faee7e1846d9b6f2583
Reviewed-on: https://skia-review.googlesource.com/c/skcms/+/864516
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
2 files changed