Fix failing test attachment downloading tests
Fix failing test attachment downloading tests

This fixes some test cases which were failing due to including the
method in the URL. This has been removed as of #210 however i neglected
to notice the failing tests. The URL no longer requires a method as
attachments can no longer be viewed, only downloaded for security reasons.

touch #210.

Inboxen/Inboxen,Inboxen/Inboxen,Inboxen/Inboxen,Inboxen/Inboxen