fix: Fix tax on donation tickets (#3260)

Author: mrsaicharan1

app/models/ticket.js

@@ -52,7 +52,7 @@ export default ModelBase.extend({
    * This attribute computes total ticket price payable after inclusion
    * of additional taxes on the base ticket price
    */
-  ticketPriceWithTax: computed('event.tax.isTaxIncludedInPrice', 'event.tax.rate', function() {
+  ticketPriceWithTax: computed('price', 'event.tax.isTaxIncludedInPrice', 'event.tax.rate', function() {
     let taxType = this.event.get('tax.isTaxIncludedInPrice');
     if (!taxType) {
       return ((1 + this.event.get('tax.rate') / 100) * this.price).toFixed(2);