Make page unscrollable when confirm modal is shown

Or we could scroll until the component is ... hidden
due to virtual-scrolling, and the modal disappears!

src/components/confirm_modal/confirm_modal.vue

@@ -1,5 +1,6 @@
 <template>
   <dialog-modal
+    v-body-scroll-lock="true"
     class="confirm-modal"
     :on-cancel="onCancel"
   >