Fix book_instance error in book renew template

Author: hamishwillee

catalog/templates/catalog/book_renew_librarian.html

@@ -1,17 +1,15 @@
 {% extends "base_generic.html" %}
 
 {% block content %}
-    <h1>Renew: {{bookinst.book.title}}</h1>
-    <p>Borrower: {{bookinst.borrower}}</p>
-    <p{% if bookinst.is_overdue %} class="text-danger"{% endif %}>Due date: {{bookinst.due_back}}</p>
+    <h1>Renew: {{book_instance.book.title}}</h1>
+    <p>Borrower: {{book_instance.borrower}}</p>
+    <p{% if book_instance.is_overdue %} class="text-danger"{% endif %}>Due date: {{book_instance.due_back}}</p>
 
     <form action="" method="post">
         {% csrf_token %}
         <table>
-        {{ form }}
+        {{ form.as_table }}
         </table>
         <input type="submit" value="Submit" />
     </form>
-
 {% endblock %}
-