Update the Skia expectation for image_8bit_devicergb_dctdecode.pdf

Update the Skia expectation for image_8bit_devicergb_dctdecode.pdf
since it has been fixed by CL [1].

[1] https://pdfium-review.googlesource.com/97791

Bug: pdfium:1862
Change-Id: I6e5039271688717ac97db37630bed6316e1938f2
Reviewed-on: https://pdfium-review.googlesource.com/c/pdfium_tests/+/98622
Reviewed-by: Lei Zhang <thestig@chromium.org>