Fix cypress test

client/src/pages/myClass.vue

@@ -42,7 +42,7 @@
               data.me.selectedClass.members = [
                 ...data.me.selectedClass.members.slice(0, memberIndex),
                 {...member, active},
-                ...data.me.selectedClass.members.slice(memberIndex),
+                ...data.me.selectedClass.members.slice(memberIndex + 1),
               ];
               store.writeQuery({query, data});
             }