k-order DLL: fix bug introduced in 1f7d3bed

For the IntSequence class, the initialization with {} and () are no longer
equivalent.
5 jobs for master in 68 minutes and 31 seconds (queued for 6 seconds)
Status Job ID Name Coverage
  Build
passed #2894
build_binaries

00:10:46

passed #2895
build_doc

00:01:58

 
  Test
passed #2898
test_dynare++

00:08:40

passed #2896
testsuite_matlab

00:57:44

manual #2897
allowed to fail manual
testsuite_octave_manual