fix(reviewer panel): force curator to assess only submitted articles

@yannis This is what I came up with to force the curator to only access submitted versions. I still need to allow them to leave a review for the last submitted version, even if a decision has been made. Let me know this looks ok.

app/pages/article/CuratorView.page.js

@@ -196,11 +196,14 @@ const CuratorView = props => {
         }
       }
 
+      const canReview = latest ? submitted && !!decision : !!decision
+
       return {
         key: version.id,
         label: <Label created={version.created} index={index} />,
         content: (
           <ReviewerPanel
+            canReview={canReview}
             decision={latest ? submitted && decision : decision}
             key={version.id}
             makeOptions={makeOptions}