add helper to show if a pet or mount is owned by the user

app/views/wow_mounts/index.html.erb

@@ -8,6 +8,7 @@
       <div class="card-body">
         <h5 class="card-title"><%= mount.name %></h5>
         <p class="card-text"><%= mount.description %></p>
+        <p class="card-text">Owned: <%= mount_owned?(mount) %></p>
         <%= link_to 'Detail', mount, class: "btn btn-primary" %>
       </div>
     </div>