Update puppet-postgresql and remove unless

modules/discourse/manifests/sitesetting.pp

 define discourse::sitesetting(
   $setting = $title,
   $value = undef,
   $type = 1,
   $ensure = 'present'
 ) {
   # Attempt some escaping
   $escaped_value = regsubst($value, '[\'\\]', '\\\1', 'G')
   $escaped_setting = regsubst($setting, '[\'\\]', '\\\1', 'G')
   $escaped_type = regsubst($type, '\D', '', 'G')
 
   case $ensure {
     default: {
       err("unknown ensure value ${ensure}")
     }
     present: {
       # This is apparently how you do a conditional INSERT in PostgreSQL - sorry
       $update_sql = "UPDATE site_settings SET value = '$escaped_value', data_type = $escaped_type WHERE name = '$escaped_setting' RETURNING 1"
       $columns = "name, data_type, value, created_at, updated_at"
       $values = "SELECT '$escaped_setting', $escaped_type, '$escaped_value', CURRENT_TIMESTAMP, CURRENT_TIMESTAMP"
 
       postgresql_psql {"WITH upd AS ($update_sql) INSERT INTO site_settings ($columns) $values WHERE NOT EXISTS (SELECT * FROM upd)":
         db => 'discourse',
-        psql_user => 'discourse',
-        unless => 'SELECT false'
+        psql_user => 'discourse'
       }
     }
     absent: {
       postgresql_psql {"DELETE FROM site_settings WHERE name = '$escaped_setting'":
         db => 'discourse',
-        psql_user => 'discourse',
-        unless => 'SELECT false'
+        psql_user => 'discourse'
       }
     }
   }
 }