Update 1751_1 expectations for collinear rectangle points

Matches https://pdfium-review.googlesource.com/c/160010

R=thestig@chromium.org

Bug: 570363704
Change-Id: I7e809b2756c7a50ae1cd2f48df127864ce5a9fe7
Reviewed-on: https://pdfium-review.googlesource.com/c/pdfium_tests/+/160230
Reviewed-by: Lei Zhang <thestig@chromium.org>
Reviewed-by: Tom Sepez <tsepez@chromium.org>

fx/path/1751_1_expected.pdf.0.png

diff --git a/fx/path/1751_1_expected.pdf.0.png b/fx/path/1751_1_expected.pdf.0.png
index f3c93d8..d66c9b3 100644
--- a/fx/path/1751_1_expected.pdf.0.png
+++ b/fx/path/1751_1_expected.pdf.0.png
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fx/path/1751_1_expected_skia.pdf.0.png

diff --git a/fx/path/1751_1_expected_skia.pdf.0.png b/fx/path/1751_1_expected_skia.pdf.0.png
index 95231aa..161c8df 100644
--- a/fx/path/1751_1_expected_skia.pdf.0.png
+++ b/fx/path/1751_1_expected_skia.pdf.0.png
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