Fix unit of idle time

According to documentation it's 's' but it is actually 'ms'
3 jobs for idle_fd in 3 minutes and 7 seconds (queued for 1 second)
Status Job ID Name Coverage
  Test
passed #20188
run-appdata

00:00:05

passed #20187
run-tests

00:02:50

 
  Build
passed #20189
run-build

00:00:11