fix: add missing discount rule to bp orders (#680)

packages/medusa-plugin-brightpearl/src/subscribers/order.js

@@ -77,6 +77,7 @@ class OrderSubscriber {
         "order.region",
         "order.swaps",
         "order.discounts",
+        "order.discounts.rule",
         "return_order",
         "return_order.items",
         "return_order.shipping_method",
@@ -109,6 +110,7 @@ class OrderSubscriber {
         "order.region",
         "order.claims",
         "order.discounts",
+        "order.discounts.rule",
         "claim_items",
         "return_order",
         "return_order.items",