Add _where() changes from pull #1517 to the PostgreSQL driver
diff --git a/system/database/DB_query_builder.php b/system/database/DB_query_builder.php
index 62e0212..4631b1b 100644
--- a/system/database/DB_query_builder.php
+++ b/system/database/DB_query_builder.php
@@ -463,7 +463,9 @@
 
 		foreach ($key as $k => $v)
 		{
-			$prefix = (count($this->qb_where) === 0 && count($this->qb_cache_where) === 0) ? $this->_group_get_type('') : $this->_group_get_type($type);
+			$prefix = (count($this->qb_where) === 0 && count($this->qb_cache_where) === 0)
+				? $this->_group_get_type('')
+				: $this->_group_get_type($type);
 
 			$k = (($op = $this->_get_operator($k)) !== FALSE)
 				? $this->protect_identifiers(substr($k, 0, strpos($k, $op)), FALSE, $escape).strstr($k, $op)
@@ -2387,4 +2389,4 @@
 }
 
 /* End of file DB_query_builder.php */
-/* Location: ./system/database/DB_query_builder.php */
+/* Location: ./system/database/DB_query_builder.php */
\ No newline at end of file