MAGETWO-69893: Error appears when restricted user tries to add new category from product page

- Updated automated test script

Author: VeronikaYarats

app/code/Magento/Catalog/Test/Mftf/Test/AdminRestrictedUserAddCategoryFromProductPageTest.xml

@@ -96,7 +96,7 @@
             <actualResult type="variable">$grabCategoryName</actualResult>
         </assertContains>
         <!--Remove the category from the product and assert that it removed-->
-        <comment userInput="Remove the category from the product and assert that it removed" stepKey="AssertCategoryRemoved"/>
+        <comment userInput="Remove the category from the product and assert that it removed" stepKey="assertCategoryRemoved"/>
         <actionGroup ref="removeCategoryFromProduct" stepKey="removeCategoryFromProduct">
             <argument name="categoryName" value="$$createCategory.name$$"/>
         </actionGroup>