Merge #3470

3470: fix(tests): get_ancestor_use_skip_list r=zhangsoledad a=zhangsoledad

<!--
Thank you for contributing to nervosnetwork/ckb!

If you haven't already, please read [CONTRIBUTING](https://github.com/nervosnetwork/ckb/blob/develop/CONTRIBUTING.md) document.

If you're unsure about anything, just ask; somebody should be along to answer within a day or two.

PR Title Format:
1. module [, module2, module3]: what's changed
2. *: what's changed
-->

### What problem does this PR solve?

test `get_ancestor_use_skip_list` was broken since #3391

### What is changed and how it works?

Make sure genesis skip_hash is none.


### Check List <!--REMOVE the items that are not applicable-->

Tests <!-- At least one of them must be included. -->

- Unit test
- Integration test
- Manual test (add detailed scripts or steps below)
- No code ci-runs-only: [ quick_checks,linters ]

### Release note <!-- Choose from None, Title Only and Note. Bugfixes or new features need a release note. -->

```release-note
None: Exclude this PR from the release note.
```



Co-authored-by: zhangsoledad <[email protected]>

sync/src/types/mod.rs

@@ -966,6 +966,9 @@ impl HeaderView {
         F: FnMut(&Byte32, Option<bool>) -> Option<HeaderView>,
         G: Fn(BlockNumber, &HeaderView) -> Option<HeaderView>,
     {
+        if self.inner.is_genesis() {
+            return;
+        }
         self.skip_hash = self
             .clone()
             .get_ancestor(