Update test expectation for another hidden annotation.

Follow up to commit e4926b9.

TBR=jaepark@google.com

Review URL: https://codereview.chromium.org/2250603002 .
diff --git a/fx/FRC_8.4_part2/FRC_8.4.2_Annotation_Flags_F_Hidden_expected.pdf.0.png b/fx/FRC_8.4_part2/FRC_8.4.2_Annotation_Flags_F_Hidden_expected.pdf.0.png
index 8d2abc4..c67b831 100644
--- a/fx/FRC_8.4_part2/FRC_8.4.2_Annotation_Flags_F_Hidden_expected.pdf.0.png
+++ b/fx/FRC_8.4_part2/FRC_8.4.2_Annotation_Flags_F_Hidden_expected.pdf.0.png
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