fix: remove duplicate icon when input type date

[lsagetlethias]

When an Input is type="date", DSFR already change the native icon with the ri-calendar icon in Webkit based browser.

In Firefox, since there is no -moz- support from DSFR, the native is displayed, therefore adding another one is wrong:

This PR remove the add of the date icon from the <Input /> component

[enguerranws]

Seems fine to me since the DSFR doesn't say anything about input date's icon overriding.

[garronej]

LGTM thanks!