Removing focus after deselect_all and select_all

[atomicpages]

Ran into an issue where I had an input field determine which items which be added to the selected box. The focus method was causing the input field to lose focus. See the following case:

<input type="email" placeholder="user@foo.com">
<select id="shuttle">
  <option value="a@foo.com">a@foo.com</option>
  <option value="b@foo.com">b@foo.com</option>
  <option value="c@foo.com">c@foo.com</option>
</select>

function foo() {
  var prev = '';
  $('input[type="email"]').on('keyup', function (e) {
    if ($(e.target).val() !== prev) {
      $shuttle.multiSelect('deselect_all'); // caused a focus change and bad UX
      // ...
    }
  }).on('focus', function (e) {
    prev = $(e.target).val();
  });
}

I don't think focusing on the shuttle after other of these method invocations is necessary.

Note: Test compiled + all unit tests passed.