Fix typo.

Experimentierfisch regelt.

biscuit/core/templates/core/crud_events_ul.html

@@ -2,7 +2,7 @@
 
 <ul class="{{ class_ul }}">
   {% for event in obj.crud_events %}
-    <li clas="{{ class_li }}">
+    <li class="{{ class_li }}">
       <div>
         <p>{{ event.user.person.full_name }}</p>
         <small>({{ event.datetime }})</small>