Bug: Range selection selects root node while trying to click on the Horizontal Rule

Lexical version:

## Steps To Reproduce

1. in Lexical playground, insert a `Horizontal Rule` via the insert button
2. click on the left part of the HR in editor but slightly higher, like shown
3. check the debugging panel, selection: range, `root` is selected
4. now press `backspace` will move focus to the first node

Link to code example: N/A
Reproducible on the official playground

## The current behavior

Root is selected

## The expected behavior

Root should not be selected

## Impact of fix