AC-1821: Registered User & Customer API fixes

	* redundant code is removed

Author: rizwankhgl

app/code/Magento/Customer/etc/webapi_rest/di.xml

@@ -22,11 +22,6 @@
     <type name="Magento\Customer\Api\CustomerRepositoryInterface">
         <plugin name="updateCustomerByIdFromRequest" type="Magento\Customer\Model\Plugin\UpdateCustomer" />
     </type>
-    <type name="Magento\Customer\Model\Plugin\UpdateCustomer">
-        <arguments>
-            <argument name="userContext" xsi:type="object">Magento\Authorization\Model\UserContextInterface</argument>
-        </arguments>
-    </type>
     <type name="Magento\Customer\Model\Customer\AuthorizationComposite">
         <arguments>
             <argument name="authorizationChecks" xsi:type="array">