Use correct css class in week_view.html

aleksis/apps/alsijil/templates/alsijil/class_register/week_view.html

@@ -157,7 +157,7 @@
                     {% if can_view_lesson_documentation %}
                       <a class="collection-item avatar"
                          href="{% url 'lesson_by_week_and_period' week.year week.week period.id %}">
-                        {% include "alsijil/partials/lesson_status_icon.html" with period=period css_class="circle" color_suffix=" " %}
+                        {% include "alsijil/partials/lesson_status_icon.html" with period=period css_class="materialize-circle" color_suffix=" " %}
                         <table class="hide-on-med-and-down">
                           <tr>
                             <th>{% trans "Subject" %}</th>