Enable pipewire-pulseaudio socket-activated user service
    
    In order to make PipeWire capable of taking over audio mixing
    from PulseAudio, we need the socket activated service enabled
    by default.
    
    Reference: https://fedoraproject.org/wiki/Changes/DefaultPipeWire
    
    Resolves: rhbz#1907906
    
    Signed-off-by: Neal Gompa <ngompa13@gmail.com>