lisa.trace: Fix trace-cmd parsing regex
Since trace-cmd can now properly report task names with spaces in them, handle space in the regex.
GitLab Maintenance scheduled for Thursday, 18th December 2025, from 7:00 AM to 10:00 AM BST. GitLab will be in read-only mode and experience short periods of complete downtime (up to 20 minutes) during this window.
Since trace-cmd can now properly report task names with spaces in them, handle space in the regex.