unloadFixtures() should run after db transaction (#4497)

Author: devonliu02

src/Codeception/Module/Yii2.php

@@ -223,17 +223,17 @@ public function _after(TestInterface $test)
         $_COOKIE = [];
         $_REQUEST = [];
 
+        if ($this->config['transaction'] && $this->transaction) {
+            $this->transaction->rollBack();
+            $this->debugSection('Database', 'Transaction cancelled; all changes reverted.');
+        }
+
         if ($this->config['cleanup']) {
             foreach ($this->loadedFixtures as $fixture) {
                 $fixture->unloadFixtures();
             }
             $this->loadedFixtures = [];
         }
-      
-        if ($this->config['transaction'] && $this->transaction) {
-            $this->transaction->rollBack();
-            $this->debugSection('Database', 'Transaction cancelled; all changes reverted.');
-        }
 
         if ($this->client) {
             $this->client->resetPersistentVars();