PowerToys cannot run as administrator

### Microsoft PowerToys version

0.99.1

### Installation method

Microsoft Store

### Area(s) with issue?

General, Mouse Without Borders

### Steps to reproduce

Launch PowerToys as Administrator and still cannot run as a service.

### ✔️ Expected Behavior

Launch as Admin and be able to run as a service.

### ❌ Actual Behavior

"use service" still greyed out.

### Upload Bug Report ZIP-file

_No response_

### Additional Information

_No response_

### Other Software

_No response_

Start by reproducing the issue with PowerToys 0.99.1 installed from the Microsoft Store, launching it as Administrator and checking Mouse Without Borders. Investigate the path controlling the greyed-out “use service” option and verify that the service can be enabled when PowerToys runs elevated.

Written by the indexing model from the issue text.