Update the AGG expectations for some corpus tests

CL [1] changed how Bezier curves are rendered for AGG. Therefore
update their corpus tests' expectations.

[1] https://pdfium-review.googlesource.com/102430

Bug: pdfium:1958
Change-Id: Ic0564c14923ec3e3a3bcf1cd4d95fe1b02aa8d1b
Reviewed-on: https://pdfium-review.googlesource.com/c/pdfium_tests/+/102471
Reviewed-by: K. Moon <kmoon@chromium.org>