MAGETWO-43288: Paypal WebAPI exception error when placing order within PayPal Payments Pro

- Fixed REST tests

Author: dkvashninbay

dev/tests/api-functional/testsuite/Magento/Quote/Api/PaymentMethodManagementTest.php

@@ -120,7 +120,6 @@ public function testSetPaymentWithSimpleProduct()
             "cartId" => $cartId,
             "method" => [
                 'method' => 'checkmo',
-                'title' => 'title',
                 'po_number' => '200',
                 'cc_owner' => 'tester',
                 'cc_type' => 'test',
@@ -160,7 +159,6 @@ public function testSetPaymentWithSimpleProductWithoutAddress()
             "cartId" => $cartId,
             "method" => [
                 'method' => 'checkmo',
-                'title' => 'title',
                 'po_number' => '200',
                 'cc_owner' => 'tester',
                 'cc_type' => 'test',