Merge pull request #1746 from Safelite/feature/CSR-1952-ajc-try2

CSR-1952: try removing original watcher with deep clone

src/fmg-components/cart/cart.vue

@@ -790,12 +790,6 @@ export default {
         },
     },
     watch: {
-        modelValue: {
-            handler(newValue) {
-                this.lineItems = deepClone(newValue);
-            },
-            deep: true,
-        },
         lineItems: {
             handler() {
                 this.$emit("update:modelValue", this.lineItems);