MAGETWO-93990: Admin user with permissions for 1 website should not be able to view the All Store Views scope on a product

- Deny displaying 'Use default' option for locked attribute in UI

Author: viktym

app/code/Magento/Catalog/Ui/DataProvider/Product/Form/Modifier/Eav.php

@@ -909,6 +909,9 @@ private function canDisplayUseDefault(ProductAttributeInterface $attribute)
         $attributeCode = $attribute->getAttributeCode();
         /** @var Product $product */
         $product = $this->locator->getProduct();
+        if ($product->isLockedAttribute($attributeCode)) {
+            return false;
+        }
 
         if (isset($this->canDisplayUseDefault[$attributeCode])) {
             return $this->canDisplayUseDefault[$attributeCode];