update to remove now-unused custom behaviors in favor of core versions

Author: henrygerardmoore

src/factory_sim/config/config.yaml

@@ -134,7 +134,6 @@ objectives:
       - "moveit_studio::behaviors::ServoBehaviorsLoader"
       - "moveit_studio::behaviors::VisionBehaviorsLoader"
       - "moveit_studio::behaviors::ConverterBehaviorsLoader"
-      - "get_filenames_from_directory::GetFilenamesFromDirectoryBehaviorsLoader"
   # Specify source folder for objectives
   # [Required]
   objective_library_paths: