Fixed test and PDO error

src/Appwrite/Extend/PDO.php

@@ -77,6 +77,7 @@ class PDO extends PDONative
             $result = $this->pdo->rollBack();
         } catch (\Throwable $th) {
             $this->pdo = $this->reconnect();
+            return false;
         }
 
         return $result;