Apply correct handler for Handler related object (#2772)

Author: KenitoInc

src/Microsoft.AspNet.OData.Shared/DeltaSetOfT.cs

@@ -216,7 +216,7 @@ internal DeltaSet<TStructuralType> CopyChangedValues(IODataAPIHandler apiHandler
                         {
                             operation = DataModificationOperationKind.Update;
 
-                            ODataAPIResponseStatus linkResponseStatus = handler.TryAddRelatedObject(original, out errorMessage);
+                            ODataAPIResponseStatus linkResponseStatus = apiHandlerOfT.TryAddRelatedObject(original, out errorMessage);
 
                             if (linkResponseStatus == ODataAPIResponseStatus.Failure)
                             {

test/E2ETest/Microsoft.Test.E2E.AspNet.OData/BulkOperation/BulkOperationTest.cs

@@ -965,11 +965,12 @@ public async Task PatchCompanies_WithUpdates_ODataId()
             }
 
             requestUri = this.BaseAddress + "/convention/Companies(1)/OverdueOrders";
+            var expected2 = "value\":[{\"Id\":2,\"Price\":20,\"Quantity\":2},{\"Id\":1,\"Price\":101,\"Quantity\":9}]}";
             using (HttpResponseMessage response = await this.Client.GetAsync(requestUri))
             {
                 var json = response.Content.ReadAsStringAsync().Result;
                 Assert.Equal(HttpStatusCode.OK, response.StatusCode);
-                //Assert.Contains(expected, json.ToString());
+                Assert.Contains(expected2, json.ToString());
             }
         }