[Quest] rework Missing in Action quest using new systems (#660)

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Автор: miraco

[Quest] rework Missing in Action quest using new systems (#660)* [Quest] rework Missing in Action quest using new systems* add changes requested in comments

Подробнее... (https://github.com/cmangos/mangos-wotlk/commit/f431ada5f9c81a7541d7a4ea4edec9b64c84cc78)