Pass the order option as an array to satisfy sqlserver adapter (#12713).

Pass the order option as an array to satisfy sqlserver adapter (#12713).

Unlike other adapters, the sqlserver adapter processes the order option and wipes it when using functions.
Here we can see a "ASC" inserted in the COALESCE call:

irb(main):001:0> Issue.order("coalesce(estimated_hours, 0), id").to_sql
=> "SELECT [issues].* FROM [issues] ORDER BY coalesce(estimated_hours ASC, 0) ASC, id ASC"

This does not happen when passing the order SQL fragments separately.

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@11115 e93f8b46-1217-0410-a6f0-8f06a7374b81