MC-4543: Convert MassAssignCustomerGroupTest to MFTF

- Removing unused argument from action group reference

Author: aljcalandra

app/code/Magento/Customer/Test/Mftf/Test/ChangeCustomerGroupTest.xml

@@ -63,8 +63,6 @@
             <group value="mtf_migrated"/>
         </annotations>
         <remove keyForRemoval="filterCustomer"/>
-        <actionGroup ref="AdminSelectAllCustomers" stepKey="selectCustomer">
-            <argument name="customerEmail" value="$customer.email$"/>
-        </actionGroup>
+        <actionGroup ref="AdminSelectAllCustomers" stepKey="selectCustomer"/>
     </test>
 </tests>