remove incorrect CSS class that lead to wrong background color (#2403)

Author: janno42

evap/staff/templates/staff_questionnaire_index_list.html

@@ -33,7 +33,7 @@
                                 </td>
                                 <td>
                                     {% if type != 'contributor' %}
-                                        <div class="btn-switch btn-group icon-buttons">
+                                        <div class="btn-group icon-buttons">
                                             <button data-is-locked="0" type="button" class="btn btn-sm change-is-locked-button btn-light{% if questionnaire.is_locked == False %} active{% endif %}" data-bs-toggle="tooltip" data-bs-placement="top" title="{% translate 'Allow editors to change the selection of this questionnaire' %}"><span class="fas fa-fw fa-lock-open" aria-hidden="true"></span></button>
                                             <button data-is-locked="1" type="button" class="btn btn-sm change-is-locked-button btn-light{% if questionnaire.is_locked == True %} active{% endif %}" data-bs-toggle="tooltip" data-bs-placement="top" title="{% translate 'Prevent editors from changing the selection of this questionnaire' %}"><span class="fas fa-fw fa-lock" aria-hidden="true"></span></button>
                                         </div>