[File-input] Update component tokens

[aidamag]

• Rename fileItemIconColor as deleteFileItemColor.
• Rename hoverFileItemIconBackgroundColor as hoverDeleteFileItemBackgroundColor and update value to color-grey-a-100.
• Rename activeFileItemIconBackgroundColor as activeDeleteFileItemBackgroundColor and update value to color-grey-a-300.
• Rename focusFileItemIconBackgroundColor as focusDeleteFileItemBackgroundColor.