Fix dashboard template around final grade status

* ae8847cd checked in buggy conditional in the dashboard templates
  that caused an empty 'details being wrapped up' box to display
  regardless of whether it was true.
* Simplify conditional so that we care only whether output of the view's
  _cert_info() says 'processing', which should be the value computed when
  either no cert status exists or when the certs are, in fact processing.

  This should mean that the "details being wrapped up" message is
  displayed when certs haven't run and the grade box is displayed the
  rest of the time.

lms/templates/dashboard/_dashboard_certificate_information.html

@@ -24,11 +24,8 @@ else:
 %>
 <div class="message message-status ${status_css_class} is-shown">
 
-% if cert_status['status'] == 'processing' and not course.may_certify():
+% if cert_status['status'] == 'processing':
       <p class="message-copy">${_("Final course details are being wrapped up at this time. Your final standing will be available shortly.")}</p>
-% elif course.may_certify() and cert_status['status'] == 'processing':
-      <!-- Certification is allowed but no cert requested, or cert unearned -->
-      <!-- <p class="message-copy">${_("Your final standing is unrequested or unavailable at this time.")}</p> -->
 % elif cert_status['status'] in ('generating', 'ready', 'notpassing', 'restricted'):
       <p class="message-copy">${_("Your final grade:")}
       <span class="grade-value">${"{0:.0f}%".format(float(cert_status['grade'])*100)}</span>.