Update corpus test expectations for anti-aliasing change

Update the expectations to match the Skia anti-aliasing changes in
https://pdfium-review.googlesource.com/c/pdfium/+/116131.

Bug: pdfium:2126
Change-Id: Icdc081e81bf327a733292e46d0599cbd3fd985fc
Reviewed-on: https://pdfium-review.googlesource.com/c/pdfium_tests/+/116690
Reviewed-by: Lei Zhang <thestig@chromium.org>
390 files changed