split into 2 lines for Lmod/bookworm compatibility

changes in /etc/profile.d/lmod.sh for debian bookworm:

MODULEPATH_INIT="/etc/lmod/modulespath"
  if [ -f ${MODULEPATH_INIT} ]; then
     for str in $(cat ${MODULEPATH_INIT} | sed 's/#.*$//'); do   # Allow end-of-line comments.
        for dir in $str; do
            if [ -d $dir ]; then
                export MODULEPATH=$(/usr/share/lmod/lmod/libexec/addto --append MODULEPATH $dir)
            fi
        done
     done
  else

modulespath needs to be splitted into 2 lines to work fine