[Error.cause] Fix length property

The options/cause property is optional, it should not increase its length.

Bug: chromium:1192162
Change-Id: Id3bcc774232320d503d327a95f5e152d0e980e0d
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2912732
Auto-Submit: Victor Gomes <victorgomes@chromium.org>
Reviewed-by: Marja Hölttä <marja@chromium.org>
Commit-Queue: Marja Hölttä <marja@chromium.org>
Cr-Commit-Position: refs/heads/master@{#74732}

src/init/bootstrapper.cc

@@ -1411,7 +1411,6 @@ static void InstallError(
   Factory* factory = isolate->factory();
 
   if (FLAG_harmony_error_cause) {
-    error_function_length += 1;
     in_object_properties += 1;
   }