Remove unneeded use of FUZZ_TARGET (#4199)

Author: jonathanmetzman

src/clusterfuzz/_internal/bot/fuzzers/afl/launcher.py

@@ -1654,7 +1654,7 @@ def main(argv):
 
   # Initialize variables.
   testcase_file_path = argv[1]
-  target_name = environment.get_value('FUZZ_TARGET')
+  target_name = argv[2]
   input_directory = environment.get_value('FUZZ_CORPUS_DIR')
 
   # FIXME: Remove this once AFL is migrated to the new engine impl and runs in

src/clusterfuzz/_internal/tests/core/bot/fuzzers/afl/afl_launcher_integration_test.py

@@ -56,8 +56,6 @@ def call_f(self, *args, **kwargs):
 def run_launcher(*args):
   """Run launcher.py."""
   mock_stdout = test_utils.MockStdout()
-
-  os.environ['FUZZ_TARGET'] = args[1]
   with mock.patch('sys.stdout', mock_stdout):
     launcher.main(['launcher.py'] + list(args))