Remove dummy next POST parameter.

(imported from commit bfe65225c1dbcb93a360d920a4c2e4955fa84372)

templates/zephyr/login.html

@@ -45,9 +45,6 @@ autofocus('#id_password');
             <input type="submit" class="btn btn-large btn-primary" value="Log in" />
         </div>
     </div>
-
-    <br />
-    <input type="hidden" name="next" value="{{ next }}" />
 </form>
 
 {% endblock %}