Fix testing/corpus pngs

Ran TOT pdfium_test on the following pdf's to fix broken PNGs:
getarray.pdf
example_014.pdf
example_015.pdf
example_054.pdf
event_fieldfull_1_.pdf

These were suppressions added in:
https://pdfium-review.googlesource.com/c/2456

Change-Id: Iff198ab545ef52a27dd395c651022b3008017579
Reviewed-on: https://pdfium-review.googlesource.com/2492
Reviewed-by: dsinclair <dsinclair@chromium.org>
diff --git a/fx/form/getarray_expected.pdf.0.png b/fx/form/getarray_expected.pdf.0.png
index a5143d9..c631b4f 100644
--- a/fx/form/getarray_expected.pdf.0.png
+++ b/fx/form/getarray_expected.pdf.0.png
Binary files differ
diff --git a/third_party/tcpdf/example_014_expected.pdf.0.png b/third_party/tcpdf/example_014_expected.pdf.0.png
index b3ca569..e30f099 100644
--- a/third_party/tcpdf/example_014_expected.pdf.0.png
+++ b/third_party/tcpdf/example_014_expected.pdf.0.png
Binary files differ
diff --git a/third_party/tcpdf/example_015_expected.pdf.0.png b/third_party/tcpdf/example_015_expected.pdf.0.png
index d508ca6..2fb78a6 100644
--- a/third_party/tcpdf/example_015_expected.pdf.0.png
+++ b/third_party/tcpdf/example_015_expected.pdf.0.png
Binary files differ
diff --git a/third_party/tcpdf/example_054_expected.pdf.0.png b/third_party/tcpdf/example_054_expected.pdf.0.png
index f1c9450..879ff8d 100644
--- a/third_party/tcpdf/example_054_expected.pdf.0.png
+++ b/third_party/tcpdf/example_054_expected.pdf.0.png
Binary files differ