OwnersList: Add missing role=list attribute

see https://www.scottohara.me/blog/2019/01/12/lists-and-safari.html

Author: Turbo87

app/components/owners-list.hbs

@@ -1,4 +1,8 @@
-<ul local-class="list {{if this.showDetailedList "detailed"}}" data-test-owners>
+<ul
+  role="list"
+  local-class="list {{if this.showDetailedList "detailed"}}"
+  data-test-owners
+>
   {{#each @owners as |owner|}}
     <li>
       <LinkTo