Use the more useful `workIndex` endpoint for list_intervals script.

Dependencies

• [2] QMEYU4MW Add display for prior intervals.

Change contents

• replacement in scripts/list_intervals.sh at line 21
  [2.14507]→[2.14507:14548](∅→∅)
  − curl --verbose --insecure --user $USER \
  [2.14507]

  [2.14548]
  + curl --verbose --user $USER \
• replacement in scripts/list_intervals.sh at line 23
  [2.14566]→[2.14566:14618](∅→∅)
  − "https://$AFTOK_HOST/api/projects/$PID/intervals"
  [2.14566]
  + "https://$AFTOK_HOST/api/projects/$PID/workIndex?limit=100&before=$(date -Iseconds)"