Fix tax amount in customer portal (#36453)

The net total is the value that is currently being displayed instead of the tax amount.
diff --git a/erpnext/templates/includes/order/order_taxes.html b/erpnext/templates/includes/order/order_taxes.html
index 0060ab3..d7b9620 100644
--- a/erpnext/templates/includes/order/order_taxes.html
+++ b/erpnext/templates/includes/order/order_taxes.html
@@ -19,7 +19,7 @@
 					{{ d.description }}
 				</div>
 				<div class="item-grand-total col-4 text-right pr-0">
-					{{ doc.get_formatted("net_total") }}
+					{{ d.get_formatted("base_tax_amount") }}
 				</div>
 			</div>
 		</div>