Merge pull request bcit-ci#2009 from Eco91/patch-2

SQLSRV - Connection error if database name contains space-characters

system/database/drivers/sqlsrv/sqlsrv_driver.php

@@ -135,7 +135,7 @@ public function db_select($database = '')
 			$database = $this->database;
 		}
 
-		if ($this->_execute('USE '.$database))
+		if ($this->_execute('USE '.$this->escape_identifiers($database)))
 		{
 			$this->database = $database;
 			return TRUE;