Fix a corpus test failure introduced by commit 84f6a56

BUG=pdfium:336
TBR=thestig@chromium.org

Review URL: https://codereview.chromium.org/1557723002 .
diff --git a/fx/other/group_xobject_expected.pdf.0.png b/fx/other/group_xobject_expected.pdf.0.png
index 6c7835c..1676452 100644
--- a/fx/other/group_xobject_expected.pdf.0.png
+++ b/fx/other/group_xobject_expected.pdf.0.png
Binary files differ