Use a PDF that's not malformed for testing

...so pdfrw doesn't choke

Use a PDF that's not malformed for testing
f66415ec · Jamy Mahabier · 04f9f7ae · f66415ec · f66415ec · f66415ec
Commit f66415ec authored 6 years ago by Jamy Mahabier
--- a/tests/data/blank-square-2pages.pdf
+++ b/tests/data/blank-square-2pages.pdf
--- a/tests/data/test-join-pdfs-square/00000.pdf
+++ b/tests/data/test-join-pdfs-square/00000.pdf
--- a/tests/data/test-join-pdfs-square/00001.pdf
+++ b/tests/data/test-join-pdfs-square/00001.pdf