Fix https://github.com/nvim-treesitter/nvim-treesitter/issues/887
(block_node) includes more nodes to fold, test with:
```yaml
days:
Monday:
- test: example
Tuesday:
- test: example
Wednesday:
- test: example
- test: example
Thursday:
- test: example
Friday:
- test: example
- foo: |
One
Two
Three
```