Tab keybinding does not work with new rendering library

**Describe the bug**
Adding a keybinding for `` does not work in lazygit versions > 0.26.1

**To Reproduce**
Steps to reproduce the behavior:
1. Add this keybinding to the `config.yml` file
```
keybinding:
universal:
return: '' # return to previous menu, will quit if there's nowhere to return
```
2. Open `lazygit`
3. Press tab
4. Focus is switched to the next panel instead of returning

**Expected behavior**
Re-mapping the tab key will work

**Desktop (please complete the following information):**
- OS: MacOS
- Lazygit Version > 0.26.1

**Additional context**
Looks like this bug was introduced with the switch to the new tcell rendering backend. The tab keybinding works in version 0.26.1 but not in any versions after.