cubicweb-collaboration #3895472 SetCreatorPermissions hook is redundant with GrantOwnersPermissions [validation pending]

It seems that the intent is to rely on owned_by relation, which is added upon entity creation to the creator. So the creator gets write permissions, just because she is part of the owners.

I suggest to drop this hook.

done in1.0.0
load left0.000
closed by#6aa87f8cb698 Drop SetCreatorPermissions hook
patchDrop SetCreatorPermissions hook [applied]