Move 'home' option to the top of populate_options()

[nacin]

When examining wp_options, whether by a query or a UI like phpMyAdmin, the first option is pretty much always going to be siteurl. For someone who is seeking to change their URL, this is helpful. However, the home option is buried. Let's bring them together. This is tiny and does very little to fix anything, but might save someone even just a little time or frustration in the future.

[nacin]

Fixed by [28260].