MAGETWO-98818: [Magento Cloud] You cannot schedule an update for the Tier price if it was set as a discount on the original price

- Updated automated test script

Author: Anahitmartirosyan

app/code/Magento/Catalog/Test/Mftf/ActionGroup/AdminProductActionGroup.xml

@@ -485,10 +485,10 @@
     </actionGroup>
     <actionGroup name="AdminProductAdvancedPricingNewCustomerGroupPrice">
         <arguments>
-            <argument name="qty" type="string"/>
-            <argument name="priceType" type="string"/>
-            <argument name="discount" type="string"/>
-            <argument name="customerGroup" type="string"/>
+            <argument name="qty" type="string" defaultValue="2"/>
+            <argument name="priceType" type="string" defaultValue="Discount"/>
+            <argument name="discount" type="string" defaultValue="75"/>
+            <argument name="customerGroup" type="string" defaultValue="0"/>
         </arguments>
         <click selector="{{AdminProductFormAdvancedPricingSection.customerGroupPriceAddButton}}" stepKey="addCustomerGroup"/>
         <fillField selector="{{AdminProductFormAdvancedPricingSection.productTierPriceQtyInput(customerGroup)}}" userInput="{{qty}}" stepKey="fillProductTierPriceQtyInput1"/>