vim: Make indenting selected lines with `>` and `<` in Helix mode no longer deselect them (#37665)

Improves Helix compatibility by making the Indent keybinds `<` and `>`
no longer deselect lines if they're selected.

Post Indent action current Zed release:
<img width="485" height="271" alt="image"
src="https://github.com/user-attachments/assets/41fd3d94-9c89-49dd-adc5-f696dbd79827"
/>
(Cursor is on the beginning of the first line)

Post Indent action in Helix:
<img width="376" height="144" alt="image"
src="https://github.com/user-attachments/assets/fdd1a489-cf3a-4638-9199-3adffa63ef61"
/>

Post Indent action in this PR:
<img width="463" height="300" alt="image"
src="https://github.com/user-attachments/assets/8edd3b81-e446-4b55-bc90-61cac3661ed7"
/>

Release Notes:

- Fixed selected lines indented with `<` and `>` deselecting in Helix
mode
2fae4c7c72Jonathan Hart committed on 9/9/2025, 7:18:22 PM· committed by GitHubparent1ae3d25
1 file changedLine totals unavailable