[PHPBB3-6493] includes/db/dbal.php uninitialised variable

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In includes/db/dbal.php there is following:

$sql_db = 'dbal_' . $dbms;

install/install_install.php, there's:

		// Load the appropriate database class if not already loaded

		include($phpbb_root_path . 'includes/db/' . $available_dbms[$data['dbms']]['DRIVER'] . '.' . $phpEx);

		// Instantiate the database

		$sql_db = 'dbal_' . $available_dbms[$data['dbms']]['DRIVER'];

		$db = new $sql_db();

		$db->sql_connect($data['dbhost'], $data['dbuser'], $data['dbpasswd'], $data['dbname'], $data['dbport'], false, false);

An uninitialised variable $dbms.