Fix field_group update

Problem/Motivation

Upgrade path test in thunder version 3 fails because of missing 'region' key in media form display.

In thunder update 8129 field groups are added to media form displays, field_group update 8301 needs to add regions to them.
Therefore it has to be ensured that Field_group update 8301 runs after thunder update 8129.

Proposed resolution

Add dependency using hook_update_dependencies().
Fix using thunder_updater to update config directly, because people might have updated already.