feat(components): Use token in FormatFile delete button

[taylorvnoj]

Motivations

Follow up to the FormatFile change earlier today where I should have used a token instead of a number for the deleteButton z-index

Changes

Changed

.deleteButton {
  z-index: 1;
}

becomes

.deleteButton {
  z-index: var(--elevation-base);
}

Testing

Should behave as before:

• click on FormatFile and then immediately click on the delete button in this story
• you can tab/focus/select the delete button with no issue

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