[0658] Fixed quests 9211 and 9213

* fixed quest 9211 (The Ice Guard) + 9213 (The Shadow Guard) : made them repeatable
This closes #510
Sources:
https://web.archive.org/web/20071103001520/http://wow.allakhazam.com/db/quest.html?wquest=9211
https://web.archive.org/web/20070604071106/http://wow.allakhazam.com/db/quest.html?wquest=9213

Signed-off-by: Cala Haryon <calaftp@free.fr>