Fix regex working-memory-size refactor error (#12119)

Fixes error in `working_memory_size()` member function passing the parameters incorrectly.
This was introduce in #11927 and found in the nightly compute-sanitizer check.
https://gpuci.gpuopenanalytics.com/job/rapidsai/job/gpuci/job/cudf/job/branches/job/cudf-gpu-build-branch-22.12/19/CUDA=11.5/testReport/junit/cudamemcheck/STRINGS_TEST/StringsContainsTests_ContainsTest/

Authors:
  - David Wendt (https://github.com/davidwendt)

Approvers:
  - Jason Lowe (https://github.com/jlowe)
  - Yunsong Wang (https://github.com/PointKernel)
  - Nghia Truong (https://github.com/ttnghia)
  - Vukasin Milovanovic (https://github.com/vuule)

URL: #12119

cpp/src/strings/regex/regexec.cpp

@@ -130,7 +130,7 @@ void reprog_device::destroy() { delete this; }
 
 std::size_t reprog_device::working_memory_size(int32_t num_threads) const
 {
-  return compute_working_memory_size(insts_counts(), num_threads);
+  return compute_working_memory_size(num_threads, insts_counts());
 }
 
 std::pair<std::size_t, int32_t> reprog_device::compute_strided_working_memory(