[generator] Make Taiwan_North use 5 threads for Index stage

Signed-off-by: Konstantin Pastbin <konstantin.pastbin@gmail.com>

tools/python/maps_generator/generator/steps.py

@@ -38,7 +38,7 @@ def multithread_run_if_one_country(func):
             kwargs.update({"threads_count": settings.THREADS_COUNT})
         # Otherwise index stage of Taiwan_* mwms continues to run after all other mwms have finished:
         elif country == 'Taiwan_North':
-            kwargs.update({"threads_count": 6})
+            kwargs.update({"threads_count": 5})
         elif country == 'Taiwan_South':
             kwargs.update({"threads_count": 2})
         func(env, country, **kwargs)