Fixed collapsing groups in aggregated webparts

[Remi749]

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Description

Fixed an issue where it was not possible to collapse groups in aggregated webparts. This is a temporary fix as the rework of the whole state has made it impossible for the state.groups to change a property

How to test

1. Gå til en av de aggregerte webdelene
2. Grupper etter Prosjekt
3. Sjekk at kollapsing per gruppe fungerer
4. Sjekk at kollapsing av alle grupperer fungerer (i header)

Relevant issues (if applicable)

#945

[tarjeieo]

Hawt stuff