fix(tracking_object_merger): fix bug and rework parameters (#823)

fix(tracking_object_merger): fix bug and use param file

Signed-off-by: kminoda <koji.minoda@tier4.jp>

Author: kminoda

autoware_launch/config/perception/object_recognition/tracking/tracking_object_merger/decorative_tracker_merger.param.yaml

@@ -23,4 +23,4 @@
 
     # logging
     enable_logging: false
-    log_file_path: "/tmp/decorative_tracker_merger.log"
+    logging_file_path: "/tmp/decorative_tracker_merger.log"