libreoffice: remove spadmin wrapper

This change removes the spadmin wrapper because the utility was removed from LibreOffice in release 4.3. See https://wiki.documentfoundation.org/ReleaseNotes/4.3#CUPS.2C_fax_machines_and_spadmin which states:

 > The graphical utility spadmin is now removed in favor of these new features and the operating system's standard printer administration tools. (Caolán McNamara)

 Closes #26671