DB errors when using image_gallery_access with postgresql 8_3

PostgresQL 8.3 no longer performs automatic typecasts to (text), which a statement in image_gallery_access.module fail because it compares acl_iga.name =t.tid where t.tid is an integer comming from: $primary_table.tid.

The attached patch fixes this by adding '' around $primary_table.tid to indicate it is supposed to be a string. I don't think this should break anything else as it should only be a more correct SQL syntax.