Fix unnecessary double space after each 'create table' in schema.sql

when ./minion db:structure:dump is executed.

Example of spaces before and after the fix between DEFAULT and CHARSET:
- Before 'CREATE TABLE foo(...) ENGINE=InnoDB DEFAULT  CHARSET=utf8;'
- After  'CREATE TABLE foo(...) ENGINE=InnoDB DEFAULT CHARSET=utf8;'

classes/Task/Db/Structure/Dump.php

@@ -27,7 +27,7 @@ protected function _execute(array $options)
 
 		$file = $options['file'] ? $options['file'] : Kohana::$config->load("migrations.path").DIRECTORY_SEPARATOR.'schema.sql';
 
-		$command = strtr("mysqldump -u:username :password -h :hostname --skip-comments --add-drop-database --add-drop-table --no-data :database | sed 's/AUTO_INCREMENT=[0-9]*\b//' > :file ", array(
+		$command = strtr("mysqldump -u:username :password -h :hostname --skip-comments --add-drop-database --add-drop-table --no-data :database | sed 's/ AUTO_INCREMENT=[0-9]*\b//' > :file ", array(
 			':username' => $db['username'],
 			':password' => $db['password'] ? '-p'.$db['password'] : '',
 			':database' => $db['database'],