fix(storage): add unused variables to method generation match (#152)

Co-authored-by: Frank Natividad <frankyn@users.noreply.github.com>

Author: HemangChothani

google/cloud/storage/_helpers.py

@@ -362,6 +362,8 @@ def update(
  query_params["projection"] = "full"
  _add_generation_match_parameters(
  query_params,
+ if_generation_match=if_generation_match,
+ if_generation_not_match=if_generation_not_match,
  if_metageneration_match=if_metageneration_match,
  if_metageneration_not_match=if_metageneration_not_match,
  )