fix(medusa): Incorrect swap difference due (#2086)

### What
Creating a swap on an order with a discount leads to an incorrect difference due. 

**Scenario**
- Create a store with minimum 2 products (Prod A, Prod B)
- Create a discount that only works for Prod A
- Create an order for Prod A with the discount applied
- Create a swap between Prod A and Prod B

**Expected outcome**
We would expect the difference_due amount to come out to the sum of:
- -1 * (price of prod a - discount applied to prod a) 
- price of prod b

**Actual outcome**
Instead the discount is applied across both products when calculating difference due. This results in a total that is instead the sum of:
- -1 * (price of prod a - discount applied to prod a)
- price of prod b - discount on prod b ignoring the condition

### How
Adds `line_item.adjustments` to relations in cart retrieval prior to setting the difference_due to car total

Fixes CORE-361

integration-tests/api/package.json

@@ -8,16 +8,16 @@
     "build": "babel src -d dist --extensions \".ts,.js\""
   },
   "dependencies": {
-    "@medusajs/medusa": "1.3.4-dev-1658251581042",
+    "@medusajs/medusa": "1.3.5-dev-1661328147668",
     "faker": "^5.5.3",
-    "medusa-interfaces": "1.3.1-dev-1658251581042",
+    "medusa-interfaces": "1.3.2-dev-1661328147668",
     "typeorm": "^0.2.31"
   },
   "devDependencies": {
     "@babel/cli": "^7.12.10",
     "@babel/core": "^7.12.10",
     "@babel/node": "^7.12.10",
-    "babel-preset-medusa-package": "1.1.19-dev-1658251581042",
+    "babel-preset-medusa-package": "1.1.19-dev-1661328147668",
     "jest": "^26.6.3"
   }
 }