Agreement show page's pdf button should link to the current copy of the agreement

[captproton]

Currently, the PDF button yields this error to an approved document:
2019-08-15T00:46:55.958136+00:00 app[web.1]: [f5b6b7af-0138-49ca-b835-028dc8b9a772] ActionView::Template::Error (The asset "true" is not present in the asset pipeline.): 2019-08-15T00:46:55.958139+00:00 app[web.1]: [f5b6b7af-0138-49ca-b835-028dc8b9a772] 8: <div class="approvals"> 2019-08-15T00:46:55.958141+00:00 app[web.1]: [f5b6b7af-0138-49ca-b835-028dc8b9a772] 9: <% @agreement.approvals.each do |approval| %> 2019-08-15T00:46:55.958144+00:00 app[web.1]: [f5b6b7af-0138-49ca-b835-028dc8b9a772] 10: <div class="full-name"> 2019-08-15T00:46:55.958146+00:00 app[web.1]: [f5b6b7af-0138-49ca-b835-028dc8b9a772] 11: <%= image_tag(approval.signature, size: "50x100") %> 2019-08-15T00:46:55.958149+00:00 app[web.1]: [f5b6b7af-0138-49ca-b835-028dc8b9a772] 12: <%= approval.signed_on.strftime("%d %b %Y") if approval.signed_on %> 2019-08-15T00:46:55.958152+00:00 app[web.1]: [f5b6b7af-0138-49ca-b835-028dc8b9a772] 13: 2019-08-15T00:46:55.958156+00:00 app[web.1]: [f5b6b7af-0138-49ca-b835-028dc8b9a772] 14: </div> 2019-08-15T00:46:55.958158+00:00 app[web.1]: [f5b6b7af-0138-49ca-b835-028dc8b9a772]