[File Input] File Item is not following the latest designs

[GomezIvann]

Describe the bug
Both the component and its specifications are not following the latest designs Alex did in the past (https://xd.adobe.com/view/31372830-345b-408b-aa2c-19ccab7f6923-6464/grid). Some parts of the design are already implemented but not reflected in the design specifications. Also, the implementation has some visual bugs, so the tasks here are:

• Preview size is inconsistent (according to the designs, should always be 24x24 px). Clear action does not have the same distance to the right border in every variant. The preview icon should be 15x15 px and not 24x24 as it currently is.

• Update specification images to match the latest designs.

Current design