Revert "update_from_4.3_new_commerce.md: opt. MySQL query"

This reverts commit 3911ca3.

Author: adriendupuis

docs/update_and_migration/from_4.3/update_from_4.3_new_commerce.md

@@ -335,7 +335,10 @@ The removable table are prefixed with `ses_` and `sve_`.
       FROM `information_schema`.`tables`
       WHERE `table_schema` = '<database_name>' AND (`table_name` LIKE 'ses_%' OR `table_name` LIKE 'sve_%')
     ;
-    EXECUTE IMMEDIATE @drop_query;
+    
+    PREPARE drop_stmt FROM @drop_query;
+    EXECUTE drop_stmt;
+    DEALLOCATE PREPARE drop_stmt;
     ```
 
 === "PostgreSQL"