Fix bin/oil.py osh -c 'echo $0'

This doesn't seem to have fixed

bin/oil.ovm osh -c 'echo $0'

Maybe sys.argv is different?

bin/oil.py

@@ -182,7 +182,7 @@ def _ShowVersion():
  print('Bytecode: %s' % pyc_version)


def OshMain(argv, login_shell):
def OshMain(argv0, argv, login_shell):
  spec = args.FlagsAndOptions()
  spec.ShortFlag('-c', args.Str, quit_parsing_flags=True)  # command string
  spec.ShortFlag('-i')  # interactive
@@ -230,7 +230,7 @@ def OshMain(argv, login_shell):
    util.WrapMethods(lexer.Lexer, trace_state)

  if opt_index == len(argv):
    dollar0 = sys.argv[0]  # e.g. bin/osh
    dollar0 = argv0
  else:
    dollar0 = argv[opt_index]  # the script name, or the arg after -c

@@ -596,12 +596,14 @@ def AppBundleMain(argv):
    if main_name.startswith("-"):
      login_shell = True
      main_name = main_name[1:]
    argv0 = argv[1]
    main_argv = argv[2:]
  else:
    argv0 = argv[0]
    main_argv = argv[1:]

  if main_name in ('osh', 'sh'):
    status = OshMain(main_argv, login_shell)
    status = OshMain(argv0, main_argv, login_shell)
    _tlog('done osh main')
    return status
  elif main_name == 'oilc':