renamed last ctag-fields to synctoken

[pfuender]

Not all fields have been renamed from ctag to synctoken with the previous commit 50d96b4.
This caused some errors like this when creating a new calendar:

exception 'Exception' with message '\Flake\Core\Model->set(): property ctag does not exist on Baikal\Model\AddressBook' in /var/www/baikal/Core/Frameworks/Flake/Core/Model.php:63
Stack trace:

0 /var/www/baikal/Core/Frameworks/BaikalAdmin/Controller/User/AddressBooks.php(151): Flake\Core\Model->set('ctag', '1')

1 /var/www/baikal/Core/Frameworks/BaikalAdmin/Controller/User/AddressBooks.php(45): BaikalAdmin\Controller\User\AddressBooks->actionNew()

2 /var/www/baikal/Core/Frameworks/Flake/Core/Render/Container.php(62): BaikalAdmin\Controller\User\AddressBooks->execute()

3 /var/www/baikal/Core/Frameworks/Flake/Controller/Page.php(82): Flake\Core\Render\Container->execute()

4 /var/www/baikal/Core/Frameworks/BaikalAdmin/WWWRoot/index.php(81): Flake\Controller\Page->render()

5 {main}

This commit renames the last missing 'ctag' references and fixes the error above.

Thanks for merging ;-)
Pfuender

[evert]

I'm going to take this PR one step further and completely remove the synctoken. The database has a default value, so there's no need for baikal to supply one.

[evert]

Just did that, thanks for the report!