Shifted keys are not fully recognized when using AutoHotKey on Windows

**Describe the bug**
The `SHIFT` modifier is missing when an AHK script is running. Thus, shifted-keys commands do not work.

In the following logs, the first one was taken with AHK enabled (notice the uppercased char `H` and the blank modifier `0x0`), the second one without:
```log
14:20:30 [TRACE] (1) gitui::app: [src\app.rs:278] event: Input(Key(KeyEvent { code: Char('H'), modifiers: KeyModifiers(0x0), kind: Press, state: KeyEventState(0x0) }))
14:24:27 [TRACE] (1) gitui::app: [src\app.rs:278] event: Input(Key(KeyEvent { code: Char('H'), modifiers: KeyModifiers(SHIFT), kind: Press, state: KeyEventState(0x0) }))
```

**To Reproduce**
1. Launch an AHK script that emulates a full keyboard layout
2. Try to use any shifted-key command in GitUI
3. Observe that it does not work

**Expected behavior**
The `SHIFT` modifier is present when using AHK and the shifted-keys commands work. Or, GitUI could rely on the character case only, although I guess the modifier is picked up for a reason.

**Context**
- Windows 10
- GitUI 0.25.1
- AutoHotKey 1.1.37.01