Fix sizing on thread data set (project-chip#13662) (project-chip#15176)

(cherry picked from commit ffd25d8)

Co-authored-by: C Freeman <[email protected]>

src/controller/AutoCommissioner.cpp

@@ -29,7 +29,7 @@ CHIP_ERROR AutoCommissioner::SetCommissioningParameters(const CommissioningParam
     if (params.HasThreadOperationalDataset())
     {
         ByteSpan dataset = params.GetThreadOperationalDataset().Value();
-        if (dataset.size() > CommissioningParameters::kMaxCredentialsLen)
+        if (dataset.size() > CommissioningParameters::kMaxThreadDatasetLen)
         {
             return CHIP_ERROR_INVALID_ARGUMENT;
         }