Destination URL updates don't carry over mobile device preference

When a destination URL is updated, we delete the existing ads, and create new ads with the same headline/description1/description2. In v201302 we added the devicePreference setting, but that setting isn't duplicated correctly for mobile campaigns. It is set back to 0. That field needs to be added to the code.

The code that does this is TextAdDAO.updateTextAdDestinationURLs().