Simplify `SyncingEngine::new()` a bit (#5396)
Tiny changes to simplify the code:
- Remove an unnecessary `collect`.
- Reduce the code duplication a little bit.
---------
Co-authored-by: 
Alexandru Vasile <[email protected]>
Tiny changes to simplify the code:
- Remove an unnecessary `collect`.
- Reduce the code duplication a little bit.
---------
Co-authored-by: Alexandru Vasile <[email protected]>