[generator] Use 56 threads for Features stage

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

tools/python/maps_generator/var/etc/map_generator.ini.prod

@@ -20,7 +20,7 @@ MAIN_OUT_PATH: /mnt/4tbexternal/osm-maps
 # Path to the data/ folder in the repository:
 USER_RESOURCE_PATH: ${Developer:OMIM_PATH}/data
 # Features stage only parallelism level. Set to 0 for auto detection.
-THREADS_COUNT_FEATURES_STAGE: 0
+THREADS_COUNT_FEATURES_STAGE: 56
 # Do not change it. This is determined automatically.
 NODE_STORAGE: mem