Undo change made to nStatesDelayedDecision; add unit test

2 jobs for bug_2324_silk_complexity_levels_2_and_3_are_swapped in 4 minutes and 59 seconds (queued for 3 seconds)
latest
Status Name Job ID Coverage
  Build
passed autoconf #10254
docker

00:04:59

passed cmake #10255
docker

00:00:50