Update 1751_1 GDI expectation for collinear rects

https://pdfium-review.googlesource.com/c/pdfium_tests/+/160230 updated
the AGG and Skia expectations, but missed the GDI one.

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

R=thestig@chromium.org

Bug: 570363704
Change-Id: I1ead1f9b6b58bec6af6e9cb2439e2b0812934f02
Reviewed-on: https://pdfium-review.googlesource.com/c/pdfium_tests/+/160270
Reviewed-by: Lei Zhang <thestig@chromium.org>
Reviewed-by: Tom Sepez <tsepez@chromium.org>