Update Db.php

Fixing query building when origin multiline query has few lines which starts from beginning of a lines. Example: 
`CREATE  FUNCTION `functionName`(id INT) RETURNS varchar(100) CHARSET utf8
BEGIN`
converted to 
`CREATE  FUNCTION `functionName`(id INT) RETURNS varchar(100) CHARSET utf8BEGIN`
Update Db.php
Merge pull request #459 from sectus/patch-1

Update Db.php