Remove unused file
Remove unused file

Looks like this was added to the incorrect location in commit da514559e.
The correct file, 'rst2pdf/tests/reference/test_option_list.pdf', was
later added in commit e00ad494f.

Signed-off-by: Stephen Finucane <06fa905d7f2aaced6dc72e9511c71a2a51e8aead@that.guru>

rst2pdf/rst2pdf,rst2pdf/rst2pdf