Remove unnecessary   in date views pager

Testing instructions:
1. Create a date view that has a pager (e.g. a month view with Calendar).
2. Look at the pager output.

Inside the li elements of the pager, a whitespace (& nbsp;) is added, which doesn't seem to have any purpose (as far as I see):

<ul class="pager">
  <li class="date-prev">
      <a href="..." rel="nofollow">&laquo; Previous</a>
      &nbsp;
  </li>
  <li class="date-next">
      <a href="..." rel="nofollow">Next &raquo;</a>
      &nbsp;
  </li>
</ul>

I attached a patch to fix this.