Remove CI_DB_pdo_driver::
Improving on PR #2265, the property is inherited with the same value and doesn't need to be set.
diff --git a/system/database/drivers/pdo/pdo_driver.php b/system/database/drivers/pdo/pdo_driver.php
index ffbafea..fa89661 100644
--- a/system/database/drivers/pdo/pdo_driver.php
+++ b/system/database/drivers/pdo/pdo_driver.php
@@ -49,13 +49,6 @@
public $dbdriver = 'pdo';
/**
- * Transaction enabled flag
- *
- * @var bool
- */
- public $trans_enabled = TRUE;
-
- /**
* PDO Options
*
* @var array