Show timetable select on tablet devices

aleksis/apps/chronos/frontend/components/TimetableWrapper.vue

@@ -164,7 +164,7 @@ export default {
 
         <!-- Calendar card-->
         <v-card v-else>
-          <div class="d-flex flex-column" v-if="$vuetify.breakpoint.smAndDown">
+          <div class="d-flex flex-column" v-if="$vuetify.breakpoint.mdAndDown">
             <v-card-title class="pt-2">
               <v-btn
                 icon