remove the semicolon before dbname (#416)

A dsn like "mysql:host=localhost;dbname=foo"
After preg_replace, the dsn become "mysql:host=localhost;"
If we have additional setting "charset: utf8", the dsn will become "mysql:host=localhost;;charset=utf8", which make propel:database:create not working

Command/DatabaseCreateCommand.php

@@ -91,7 +91,7 @@ class DatabaseCreateCommand extends AbstractCommand
         $dbName = $this->parseDbName($config['dsn']);
 
         $config['dsn'] = preg_replace(
-            '#dbname='.$dbName.';?#',
+            '#;?dbname='.$dbName.';?#',
             '',
             $config['dsn']
         );