pjaxSettings['options']['id'] is not set even tho it's configured

[adamwinn]

Prerequisites

• [x] I have searched for similar issues in both open and closed tickets and cannot find a duplicate.
• [x] The issue still exists against the latest master branch of yii2-dynagrid.
• [x] This is not an usage question. I confirm having gone through and read the documentation and demos.
• [x] This is not a general programming / coding question. (Those should be directed to the webtips Q & A forum).
• [x] I have attempted to find the simplest possible steps to reproduce the issue.
• [ ] I have included a failing test as a pull request (Optional).

I set the my dynagrid as below and wanted to name my pjax container differently so I could match it to my unique pjaxContainerId. Instead pjaxSettings['options']['id'] is not set and is set to the default of $grid->options['id'] . '-pjax';

echo DynaGrid::widget([
    'columns' => $columns,
    'gridOptions'=>[
        'pjaxSettings' => ['options' => ['id' => 'kv-pjax-container']],
        'pjax'=>true,
        'dataProvider'=>$dataProvider,
        'filterModel'=>$searchModel,
    ],
    'options'=>['id'=>'store-review-grid'] // a unique identifier is important
]);

HTML source has:

<div id="store-review-grid"><div id="store-review-grid-pjax" data-pjax-container="" data-pjax-push-state data-pjax-timeout="1000">

• yii2-dynagrid version: dev-master

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