Remove depth limit for group components

[TomasEng]

When a user tries to move a component so that a group becomes deeper than two levels, they receive a warning and the action is cancelled.

This is because of an old restriction in the apps that no longer exists. Groups may now (theoretically) have an infinite number of levels. We should therefore remove this restriction from Studio as well.

In order to help the user create a user friendly app, we may consider to implement some sort of warning instead, that doesn't stop the user from performing the intended action.