Remove the unused `map` param from `fixBinaryOperator`.
Remove the unused `map` param from `fixBinaryOperator`.

alangpierce/decaffeinate,alangpierce/decaffeinate,eventualbuddha/decaffeinate,eventualbuddha/decaffeinate,decaffeinate/decaffeinate,decaffeinate/decaffeinate,alangpierce/decaffeinate