Scrolling with space doesn't work in reader mode.

- **Min Version:** 1.25.1
- **Operating system:** Arch Linux 5.19.11-arch1-1

## Expected Behavior
The page should scroll normally in **Reader Mode** using `space`.

## Actual Behavior
The page doesn't scroll at all.

## To Reproduce
- Open any URL.
- Enable **Reader Mode**
- Press `space`
