correct rails route for csv download

Author: thommahoney

app/views/staff/proposals/index.html.haml

@@ -22,7 +22,7 @@
 .row
   .col-sm-offset-6.col-sm-6
     .btn-nav.text-right
-      = link_to event_staff_proposals_path(format: "csv"), id: "download_link", class: "btn btn-info btn-sm" do
+      = link_to event_staff_program_proposals_path(format: "csv"), id: "download_link", class: "btn btn-info btn-sm" do
         %span.glyphicon.glyphicon-download-alt
         Download CSV
 .row