Goal function should print maximization

[jxmorris12]

the input reduction recipe prints the following:

Attack(
  (search_method): GreedyWordSwapWIR(
    (wir_method):  delete
  )
  (goal_function):  InputReduction(
    (target_num_words):  1
  )
  (transformation):  WordDeletion
  (constraints): 
    (0): RepeatModification
    (1): StopwordModification
  (is_black_box):  True
)

however, it should be clear from the print message that the InputReduction goal function is to be maximized (not achieved)

[uvafan]

It should also not print target_num_words if it's maximizable, since it doesn't have any effect when it's maximizable.