jjmata: the _pdf_import.html.erb scoping change was not covered by the
existing test (which only hit /import/uploads). Add a regression test
hitting GET /imports/:id with a PdfImport fixture, asserting the
account dropdown options match accessible accounts only.
Also swap the PDF partial's accounts.map { |a| [a.name, a.id] } for
.pluck(:name, :id) to match the .pluck pattern the other three CSV/QIF
selects already use.