#1056 at variants the childs don´t toggle own checkbox icon at same time as parent (state: open)

Checklist before I submit this issue report

I confirm that:

• I have tested this with the latest version available
• I have read documentation @ http://metamodels.readthedocs.org/en/ or http://metamodels.readthedocs.org/de/
• I have checked the Contao community forums for references https://community.contao.org/
• I have checked existing issues for duplicates and found none @ https://github.com/MetaModels/core/issues?q=is%3Aissue

My environment is:

(Please fill in the actual values from your environment)

Issue description

see screenshot

Steps to reproduce

1. in metamodels with variants add checkbox attribute and activate own status icon
2. show list view at backend and toggle status of parent
3. the values of childa are updatet at database, but we see the old status icon

Screenshots

Check in MM 2.2: the behaviour is still like this

Die Icons werden nach einem erfolgreichen AJAX-Response gewechselt - hier müsste eine Anpassung für Varianten beim DCG eingebaut werden https://github.com/contao-community-alliance/dc-general/blob/d878513fa1eaa68f522d901ade93501d78ad2b6e/src/Resources/public/js/generalDriver_src.js#L105

Leider ist der Aufbau des Baumes nicht sehr elegant - die Varianten sind auf gleicher LI-Ebene wie die Varianten-Basis.