fix(lvm): clean up whitespace in messages

The lvm module has been printing messages with whitespace damage:

  Scanning devices sda sdb  for LVM logical volumes vg/root
  vg/swap

Remove the trailing space after the final device name, and remove the
newlines between LV names.  The message above becomes:

  Scanning devices sda sdb for LVM logical volumes vg/root vg/swap

modules.d/90lvm/lvm_scan.sh

@@ -134,7 +134,7 @@ check_lvm_ver 2 3 14 "$maj" "$min" "$sub" \
  && scan_args="$scan_args --nohints"
 
 if [ -n "$LVS" ]; then
- info "Scanning devices $lvmdevs for LVM logical volumes $LVS"
+ info "Scanning devices ${lvmdevs% } for LVM logical volumes ${LVS//$'\n'/ }"
  # shellcheck disable=SC2086
  LVSLIST=$(lvm lvs $scan_args --noheading -o lv_full_name,segtype $LVS)
  info "$LVSLIST"