Fix codeception tests (#94)

codeception.yml

@@ -12,6 +12,7 @@ modules:
     config:
         Yii2:
             configFile: 'config/test.php'
+            cleanup: false
 
 # To enable code coverage:
 #coverage:

tests/functional.suite.yml

@@ -10,5 +10,4 @@ class_name: FunctionalTester
 modules:
     enabled:
       - Filesystem
-      - Yii2:
-          cleanup: false
+      - Yii2