hostnamectl: fix hyperlink in "Operating System" field
    
    This fixes a bug introduced by 822be62fb23ed0ec1062ffd18057e53f6c2f8c01.
    
    Before this, if terminal width is not enough, the all subsequent lines
    are included in the hyperlink.
    
    Fixes https://bugzilla.redhat.com/show_bug.cgi?id=1955475.
    
    (cherry picked from commit 8fc1efa88fb935ab4357fa39ed71ccb70df55d7e)