osbuild: re-enable workstation osbuild and rename
    
    The name used for the Fedora-Workstation-Live was the same with
    livemedia and osbuild, and that was causing the livemedia build to fail.
    So, lets re-enable the workstation osbuild version, but add a -osb to
    the name (and thus make it another package in koji) so they don't
    overlap.
    
    Open to better ways to handle this, but this seems easiest to me...
    
    CC: @lsedlar @thozza @supakeen
    
    Signed-off-by: Kevin Fenzi <kevin@scrye.com>