fix: dont write log file for completion commands

[lukekarrys]

Since npm completion is implemented by calling npm completion -- arg1
this will write a logfile for that command. I noticed this as I was trying
to look through my logs for a recent command and found that it had been removed
since I used enough tab completions to fill logs-max.

[lukekarrys]

Here's what a grep of my logs looked like previously:

❯ grep -r "argv" _logs/
_logs//2024-05-09T19_05_19_129Z-debug-0.log:8 verbose argv "completion" "--" "npm" "vi"
_logs//2024-05-09T19_05_18_423Z-debug-0.log:8 verbose argv "completion" "--" ""
_logs//2024-05-09T19_05_20_636Z-debug-0.log:8 verbose argv "completion" "--" "npm" "view" ""
_logs//2024-05-09T19_05_18_304Z-debug-0.log:8 verbose argv "completion"