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>