Update whitelist.txt

http://forum.adguard.com/showthread.php?2447
script was cutted. Need to fix rule to
~ecoteka.ru,~yandex.ru,~yandex.com,~yandex.ua,~yandex.kz,~yandex.by,~mp3poisk.ru$$script[tag-content="Ya.Metrika"][max-length="1500"]