revert ActiveRelationTrait abstract methods

this does not seem to work the same way as interfaces:

```
PHP Fatal error:  Declaration of
yii\db\ActiveRelationTrait::andWhere($condition) must be compatible with
yii\db\Query::andWhere($condition, $params = Array)
```

framework/db/ActiveRelationTrait.php

@@ -536,16 +536,4 @@ trait ActiveRelationTrait
 
         return $this->asArray()->all($primaryModel::getDb());
     }
-
-    /**
-     * @see ActiveQueryInterface::andWhere()
-     * @return ActiveQueryInterface
-     */
-    abstract public function andWhere($condition);
-
-    /**
-     * @see ActiveQueryInterface::asArray()
-     * @return ActiveQueryInterface
-     */
-    abstract public function asArray($value = true);
 }