Added link to case list, when viewing case

It relies on the referer, and isn't very good.

modules/opencase_entities/src/Entity/OCCase.php

@@ -277,6 +277,9 @@ class OCCase extends RevisionableContentEntityBase implements OCCaseInterface {
           'placeholder' => '',
         ],
       ])
+      ->setDisplayOptions('view', [
+        'label' => 'above',
+      ])
       ->setDefaultValueCallback('Drupal\opencase_entities\Entity\OCCase::defaultVal')
       ->setRequired(TRUE);