fix(scripts): properly support the database update

[Byloth]

Currently, it's possible to perform some specific actions on the database by running the builder/run.sh script.
There's also an update-db option which should allow you to update the current database applying all the latest updates.

Under the hood, this option perform various actions and is usually enough to successfully update the database.
However, sometimes it doesn't update the database correctly and some manual actions are required to complete the database update.

Unfortunately, this problem cannot be solved yet because one of the scripts from the official CMaNGOS codebase, used for the update, cannot be run in non-interactive mode.
Until this script is fixed, this issue cannnot be solved.

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Let's track it here...

[Byloth]

I just opened the PR that will fix this here: cmangos/tbc-db#1112

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Waiting for the others 2 DB repos: classic-db and wotlk-db...