Wrap filters correctly

aleksis/apps/alsijil/frontend/components/coursebook/CoursebookFilters.vue

 <template>
-  <div class="d-flex flex-grow-1 justify-end">
+  <div class="d-flex flex-column flex-sm-row flex-nowrap flex-grow-1 justify-end gap align-stretch">
     <v-autocomplete
       :items="selectable"
       item-text="name"