fix purchase order input bug

resources/assets/vue/components/bookings/forms/PurchaseOrderItemFormComponent.vue

@@ -25,7 +25,7 @@
         <div class="col-1 text-right p-r-5 p-l-5">
             <div class="font-heading all-caps fs-10">{{(Math.round((productTotal + Number.EPSILON) * 100) / 100).toFixed(2) }}</div>
         </div>
-        <div class="col-auto" v-if="editable">
+        <div class="col-auto" :class="[{'invisible': !editable}]">
             <button class="btn btn-xs btn-outline-danger b-rad-none" @click="$emit('remove')"><i class="fa fa-times"></i></button>
             <button v-if="!isEdit" class="btn btn-xs btn-outline-warning b-rad-none" @click="isEdit = !isEdit"><i class="fa fa-pencil"></i></button>
             <button v-if="isEdit" class="btn btn-xs btn-outline-success b-rad-none" @click="updateProduct()"><i class="fa fa-check"></i></button>