`dired +dirvish` Cannot use `TAB` to toggle dirvish subtree

### I confirm that...

- [x] I have searched the [issue tracker](https://github.com/doomemacs/doomemacs/issues), [documentation](https://docs.doomemacs.org), [FAQ](https://docs.doomemacs.org/-/faq), [Discourse](https://discourse.doomemacs.org), and [Google](https://google.com), in case this issue has already been reported/resolved.

- [x] I have read "[How to Debug Issues](https://doomemacs.org/d/how2debug)", and will use it to provide as much information about this issue as possible.

- [x] The issue can be reproduced on the **latest** available commit of Doom.

- [x] The issue can be reproduced on a stable release of Emacs, such as 27, 28, or 29. *(Unstable versions end in .50, .60, or .9x)*

### Expected behavior

Use Doom Emacs' `.emacs.d` folder as an example:

When I hit `TAB`, it should toggle the subtree of that folder:

### Current behavior

Hitting `tab` in Dirvish does nothing. It only causes a message saying `Buffer is read-only`.

### Steps to reproduce

1. use `(dired +dirvish +icons)` in `.doom.d/init.el` and execute `doom sync`
2. open a folder (say folder A) containing another folder (say folder B) inside Emacs
3. move the cursor to the line of folder B and hit `TAB` to see if the dirvish subtree toggles

### System Information

https://pastebin.com/jZT6k3wB

Start with the Dired configuration in `.doom.d/init.el`, using `(dired +dirvish +icons)` to reproduce the issue. Inspect how TAB is handled when the cursor is on a subdirectory and verify that it toggles the Dirvish subtree instead of only reporting `Buffer is read-only`.

Written by the indexing model from the issue text.