Caps Lock assignment to Alt+Shift cannot be be remapped

### Microsoft PowerToys version

0.97.2

### Installation method

Microsoft Store

### Area(s) with issue?

Keyboard Manager

### Steps to reproduce

Hello,
There is an issue assigning `CapsLock` to `Alt+Shift`. When the remapping is being saved an message dialog appears:
> Some of the keys could not be remapped. Do you want to continue anyway?

I have tried normal (user) and elevated privilege (run as administrator) executions, both fail.

### ✔️ Expected Behavior

Since `Alt+Shift` is not conisidered as a [system/reserved shortcut](https://learn.microsoft.com/en-us/windows/powertoys/keyboard-manager) according to the docs, the combination should be saved properly and remapped.

### ❌ Actual Behavior

Both dialog options - `Continue anyway` and `Cancel` does the same thing - the Remap Keys window is closed along with the dialog and nothing is saved.

### Upload Bug Report ZIP-file

_No response_

### Additional Information

Windows 11 Pro

### Other Software

_No response_

Start in Keyboard Manager's Remap Keys flow and reproduce assigning CapsLock to Alt+Shift on Windows 11 with PowerToys 0.97.2. Trace why saving shows the remapping warning and closes without saving; done when the mapping persists and the dialog options behave correctly.

Written by the indexing model from the issue text.