Fixes #18357 - SQL error when table prefix used.

Author: pocallaghan

app/code/Magento/CheckoutAgreements/Model/ResourceModel/Agreement/Grid/Collection.php

@@ -64,7 +64,7 @@ private function getStoresForAgreements()
 
         if (!empty($agreementId)) {
             $select = $this->getConnection()->select()->from(
-                ['agreement_store' => 'checkout_agreement_store']
+                ['agreement_store' => $this->getResource()->getTable('checkout_agreement_store')]
             )->where(
                 'agreement_store.agreement_id IN (?)',
                 $agreementId