Remove attribute sorting

[vjik]

Based on #232

Sorting was done in first implementation of HTML helper: yiisoft/yii2@30d70be

[samdark]

It was not the case for Yii1: https://github.com/yiisoft/yii/blob/master/framework/web/helpers/CHtml.php#L2810

[FrankiFixx]

I work on it