chore(group): remove useless code

[kisvegabor]

fixes #5955

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[XuNeo]

It looks not that straight forward. Awesome if you could explain a bit :)

[kisvegabor]

Sure! We call lv_group_remove_obj(obj); first, so we can be sure that the object is not in the group after that anymore. Therefore the two removed sections are pointless:

    /*Do not add the object twice*/   -->  It's already removed cannot be added twice

    /*If the object is already in a group and focused then refocus it*/ --> Removed, cannot be in the group