Correctly set GrAttachment mipmapped flag.

Change-Id: I7b69d96367c36cbe217ec43c5361a2ceb49dbb9e
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/434677
Auto-Submit: Greg Daniel <egdaniel@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>
Reviewed-by: Brian Salomon <bsalomon@google.com>
2 files changed