Date's date_views 2.11 breaks exposed form HTML id's and classes

The following lines addition in the date_views module:

cause the exposed filters element wrapper to have useless classes.

Steps to reproduce correct behaviour using Date 2.10:

1. Create a view with exposed date field
2. Assign custom identifier to the exposed date field (e.g. 'my-date').
3. Views generated HTML will use this id for form field and for the wrapper div ('edit-my-date', etc). You can now use this for styling and js.

Steps to reproduce incorrect behaviour using Date 2.11:

1. Create a view with exposed date field
2. Assign custom identifier to the exposed date field (e.g. 'my-date').
3. Views generated HTML will use uncontrollable (and randomized) id for both wrapper div and form field, as caused by the line 327