fix(datepicker): use td in arrows navigation

[aitboudad]

No description provided.

[wesleycho]

LGTM, but there might be a reason why a div was used over a td.

Did this cause a particular issue for you?

[aitboudad]

to make arrows consistent and to simplify applying custom styles

[maxokorokov]

@wesleycho no, there simply was a markup bug with next button

<table>
  <tr>
    <td>Prev</td>
    <td>...</td>
    <div>Next</div>
  </tr>
</table>

@aitboudad thanks for noticing