Fix checking active carrier against store

[torreytsui]

Issue

Scope specifically enabled carrier does not work

Bug Reproduction

Prerequisite

There are two websites.

Flatrate is disabled in default scope and the first website, and enabled in the second website.

NOTE: We need two websites in this test case to make sure the MAGE_RUN_CODE will only be set against the first website when visiting Admin Panel

Steps

1. Go to Admin > Order > New Order > New Customer > select a store in the second website.
2. Add a product to basket
3. Fill in the addresses
4. Chose any payment method
5. Click Get shipping methods and rates

Expected Result

Flatrate shows up as avaliable shipping method

Actual Result

Flatrate does not show up

Cause of issue

\Magento\Shipping\Model\CarrierFactory::createIfActive only check if a carrier is active against a scope resolved by scope-resolver which takes the MAGE_RUN_CODE to resolve. If a carrier is disabled by default and by the the website of MAGE_RUN_CODE and only enabled for specific websites, the method will return false which is wrong

[okorshenko]

@torreytsui thank you for your contribution!