Wrong Store Id when creating order in admin, with single store.

incorrect_store_id_for_admin_orders.patch

--- Model/Session/Quote.php  2020-08-04 13:55:36.438626071 +0000
+++ Model/Session/Quote.php       2020-08-04 13:56:16.990487672 +0000
@@ -134,7 +134,7 @@
             $cookieMetadataFactory,
             $appState
         );
-        if ($this->_storeManager->hasSingleStore()) {
+        if ($this->_storeManager->isSingleStoreMode()) {
             $this->setStoreId($this->_storeManager->getStore(true)->getId());
         }
     }