pgrep: don't show msg if pattern is 15 chars long

[cakebaker]

The original pgrep shows a message if the pattern is longer than 15 chars:

$ pgrep 123456789012345
$ pgrep 1234567890123456
pgrep: pattern that searches for process name longer than 15 characters will result in zero matches
Try `pgrep -f' option to match against the complete command line.

We showed this message if the pattern was 15 chars or longer. This PR fixes the issue.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 0.00%. Comparing base (43f7412) to head (a044ad4).
Report is 3 commits behind head on main.

Additional details and impacted files

@@     Coverage Diff     @@
##   main   #329   +/-   ##
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