Apply ripple effect to list items

aleksis/apps/alsijil/frontend/components/coursebook/statistics/StatisticsForPersonPage.vue

@@ -25,7 +25,7 @@
           </v-btn-toggle>
         </template>
         <template #default="{ items }">
-          <v-list-item v-for="item in items" :key="item.id">
+          <v-list-item v-for="item in items" :key="item.id" ripple>
             <v-list-item-content>
               <v-list-item-title>
                 <!-- date & timeslot -->