Pop-up windows don't disable irrelevant key mappings

**Describe the bug**
Pop-up windows don't disable shortcuts, e.g. the prompt `Are you sure you want to quit?` allows me to press `z` and trigger `undo`. Or even press `x` to bring up the menu.

**To Reproduce**
Steps to reproduce the behavior:
1. Set `confirmOnQuit: true` in your config
2. Press `q` in `lazygit`
3. Press `x` or `z`
4. It does the action that the key is mapped to

**Expected behavior**
Pressing things not relevant to the pop-up shouldn't do anything

**Screenshots**

**Desktop (please complete the following information):**
- OS: archlinux
- Lazygit Version 0.31.4
- The last commit id if you built project from sources: N/A

**Additional context**
The reason I press `z` instead of `y` when quitting is because I often switch between two keyboard layouts and forget what's the current one I'm using.