MC-17003: Update Totals button is missing from Credit Memo page

Author: DianaRusin

app/code/Magento/Sales/Block/Adminhtml/Order/Creditmemo/Create/Items.php

@@ -56,7 +56,7 @@ protected function _prepareLayout()
         $this->addChild(
             'update_button',
             \Magento\Backend\Block\Widget\Button::class,
-            ['label' => __('Update Qty\'s'), 'class' => 'update-button', 'onclick' => $onclick]
+            ['label' => __('Update Qty\'s'), 'class' => 'update-button secondary', 'onclick' => $onclick]
         );
         $this->addChild(
             'update_totals_button',