Remove privileged operation from minimize task

[jonathanmetzman]

Traceback (most recent call last):
  File "/mnt/scratch0/clusterfuzz/src/python/bot/startup/run_bot.py", line 128, in task_loop
    sys.exit(utasks.uworker_bot_main())
  File "/mnt/scratch0/clusterfuzz/src/clusterfuzz/_internal/bot/tasks/utasks/__init__.py", line 220, in uworker_bot_main
    uworker_main(input_download_url)
  File "/mnt/scratch0/clusterfuzz/src/clusterfuzz/_internal/bot/tasks/utasks/__init__.py", line 202, in uworker_main
    uworker_output = utask_module.utask_main(uworker_input)
  File "/mnt/scratch0/clusterfuzz/src/clusterfuzz/_internal/bot/tasks/utasks/minimize_task.py", line 435, in utask_main
    testcase_file_path)
  File "/mnt/scratch0/clusterfuzz/src/clusterfuzz/_internal/bot/tasks/utasks/minimize_task.py", line 1600, in do_libfuzzer_minimization
    set_dedup_flags=True)
  File "/mnt/scratch0/clusterfuzz/src/clusterfuzz/_internal/bot/tasks/utasks/minimize_task.py", line 1404, in _run_libfuzzer_tool
    arguments = data_handler.get_arguments(testcase).split()
  File "/mnt/scratch0/clusterfuzz/src/clusterfuzz/_internal/datastore/data_handler.py", line 369, in get_arguments
    fuzzer_display = get_fuzzer_display(testcase)
  File "/mnt/scratch0/clusterfuzz/src/clusterfuzz/_internal/datastore/data_handler.py", line 333, in get_fuzzer_display
    fuzz_target = get_fuzz_target(testcase.overridden_fuzzer_name)
  File "/mnt/scratch0/clusterfuzz/src/clusterfuzz/_internal/datastore/data_handler.py", line 1682, in get_fuzz_target
    return ndb.Key(data_types.FuzzTarget, name).get()
  File "/mnt/scratch0/clusterfuzz/src/third_party/google/cloud/ndb/_options.py", line 89, in wrapper
    return wrapped(*pass_args, **kwargs)
  File "/mnt/scratch0/clusterfuzz/src/third_party/google/cloud/ndb/utils.py", line 110, in positional_wrapper