Update Skia expectation caused by Skia roll

Skia CL [1] causes minor anti-aliasing discrepancies in path
rendering. This CL updates the corpus tests which are affected by
this roll.

[1] https://skia-review.googlesource.com/c/skia/+/639316

Change-Id: Ic763a764e3011e7cda471161f70173780807a7dc
Reviewed-on: https://pdfium-review.googlesource.com/c/pdfium_tests/+/104274
Reviewed-by: Lei Zhang <thestig@chromium.org>