Inverted Flatlist has incorrect keyboard handling

### Description

When Flatlist is inverted and `enableSelectionOnKeyPress` is true, ArrowUp and ArrowDown select the wrong row. 

### Version

0.66+

### Output of `npx react-native info`

n/a

### Steps to reproduce

Flatlist test page in RN-Tester should be sufficient

### Snack, code example, screenshot, or link to a repository

_No response_