Hot reload keyboard shortcut Ctrl+\ no longer works

## Steps to Reproduce

In Android Studio Hedgehog (the version now approaching stable release), the keyboard shortcut Ctrl+\ for hot reload no longer works.

The "Flutter Hot Reload" button is still there — up in the toolbar at the top in the same row with "Run" and "Debug", as well as down in the "Run" tool window. If I press the button with the mouse it still works. Hovering on the button, it also still reports Ctrl+\ as a keyboard shortcut.

But if I hit Ctrl+\ , nothing happens.

This was working fine for me in Flamingo. I recently upgraded to Hedgehog, skipping Giraffe.

This issue applies both with and without the New UI.

## Version info

```
$ flutter doctor -v
[!] Flutter (Channel [user-branch], 3.16.0-17.0.pre.37, on Debian GNU/Linux 10 (buster)
4.19.0-25-amd64, locale en_US.UTF-8)
! Flutter version 3.16.0-17.0.pre.37 on channel [user-branch] at /home/greg/n/flutter/flutter
Currently on an unknown channel. Run `flutter channel` to switch to an official channel.
If that doesn't fix the issue, reinstall Flutter by following instructions at
https://flutter.dev/docs/get-started/install.
! Upstream repository unknown source is not a standard remote.
Set environment variable "FLUTTER_GIT_URL" to unknown source to dismiss this error.
• Framework revision 1c90ed8b64 (38 minutes ago), 2023-10-25 13:24:15 -0700
• Engine revision 6e09ee14e2
• Dart version 3.3.0 (build 3.3.0-56.0.dev)
• DevTools version 2.28.1
• If those were intentional, you can disregard the above warnings; however it is recommended to
use "git" directly to perform update checks and upgrades.

[…]
[✓] Android Studio (version 2023.1)
• Android Studio at
/home/greg/.local/share/JetBrains/Toolbox/apps/AndroidStudio/ch-0/231.9392.1.2311.10949950
• Flutter plugin version 75.1.3
• Dart plugin can be installed from:
🔨 https://plugins.jetbrains.com/plugin/6351-dart
• Java version OpenJDK Runtime Environment (build 17.0.7+0-17.0.7b1000.6-10550314)
```