Fix thread pagination

Related issue - #556 (closed).

It looked like there was only forward direction support (not completely correct). But default behaviour in thread is backward direction. Also increased first fetch from 10 to 30 (when limit: None). 10 can force second request (default limit in element - 50).

Also delete manual sorting after getting from database (can't say for sure if this is necessary).

I also checked the fix on the server I'm using.

We will look into this very soon, just so it doesn't feel like the contribution is lost. Thank you!

merged manually

closed

Merged in https://github.com/girlbossceo/conduwuit/commit/2e4d9cb37cf7d47a9506ee3697775ddfadcb1d56