fix SQL statement

[jdshaw]

• Fixes SQL statement to
  • prevent an Omeka-S error for anonymous (not logged in users)
  • correctly add the is_public portion to the WHERE clause

As it was, previous to the addition of ASC to the ORDER BY clause, the is_public piece seems to have done nothing. I believe it was intended to be in the WHERE clause.

[Daniel-KM]

Indeed, i updated the query in many places and didn't check here.