Revert "Remove obsolete Group tag"
    
    We maintain an upstream specfile of NetworkManager [1] that shall be suitable
    for all Fedora/RHEL releases. As such, there are still releases for
    which we want to keep the group tag.
    
    Revert the patch, so that the difference between Fedora's and upstream's
    specfile is minimized.
    
    [1] https://cgit.freedesktop.org/NetworkManager/NetworkManager/tree/contrib/fedora/rpm/NetworkManager.spec?id=96be30cbcc59494d45e3b2f3bd605e00050674ed
    
    This reverts commit 62adcbc888c62d8ab32531327e064fcc6581ca30.