On Windows, Zed shows some shortcuts using the keys a person presses. 

For example, it displays `ctrl-@` as `Ctrl-Shift-2`. Which Key was
dropping that Windows-specific label and showing `Ctrl-@`, while the
command palette and keymap editor showed `Ctrl-Shift-2`.

This PR makes Which Key use the same shortcut labels as the rest of Zed.

**Before:**

Which Key (Shows `Ctrl-@`):

<p>
<img height="70" alt="image"
src="https://github.com/user-attachments/assets/9272ba29-1ebc-4329-8bd3-ec42937766c8"
/>
</p>

Keymap Editor (Shows `Ctrl-Shift-2` instead of `Ctrl-@`):

<p>
<img height="50" alt="image"
src="https://github.com/user-attachments/assets/3c36d887-2cb8-45fc-9672-6a8ea2ba2f4d"
/>
</p>

Command Palette (Shows `Ctrl-Shift-2` instead of `Ctrl-@`):

<p>
<img height="70" alt="image"
src="https://github.com/user-attachments/assets/2619a84b-341d-4ee4-89fb-4db62c3569dc"
/>
</p>

**After:**

<p>
<img height="70" alt="image"
src="https://github.com/user-attachments/assets/212f4d6e-e07d-4857-a0e7-e526611f2fcb"
/>
<p>

Release Notes:

- Fixed inconsistent shortcut labels in Which Key on Windows.