clang-format: Fix ObjC method exprs with variadic parameters.

Before:
  _versionLabel.text = [
    NSString stringWithFormat:NSLocalizedString(@"version: %@", @"Label"),
    [NSBundle mainBundle].infoDictionary[@"CFBundleShortVersionString"]
  ];

After:
  _versionLabel.text =
      [NSString stringWithFormat:NSLocalizedString(@"version: %@", @"Label"),
          [NSBundle mainBundle].infoDictionary[@"CFBundleShortVersionString"]];

This fixed llvm.org/PR17695.