Remove base form fields from block edit in composer mode

You should use: 
```javascript
 var $childBlock = $(['<li class="page-composer__container__child">',
    '<a class="page-composer__container__child__edit">',
        '<h4 class="page-composer__container__child__name">',
            '<input type="text" class="page-composer__container__child__name__input" />',
        '</h4>',
    '</a>',
'</li>'].join(''));
```