feat(windows): use Keyboard Icon in the Windows Start Menu

### Is your feature request related to a problem? Please describe.

I feel like I've requeted this before but can't find it via searching the issues -apologies if this is a duplicate.

When a keyboard is installed on Windows it receives a subsection entry in the Windows Start Menu. The Windows entry includes the keyboard by name (with the general Keyman icon), the uninstaller, and optionally a manual and license file if the keyboard author has included them. When a user has many keyboards installed, the generic Keyman icon is not helpful in visually distinguishing between the menu entries.

### Describe the solution you'd like

The icon that is associated with the specific keyboard, that is used in the taskbar, would be good to apply in its Start Menu entry. This gives the user a visual aid to identify their keyboard quickly. Even if the Start Menu entry is launching the keyman executable, I believe this entry will launch it and load the expected keyboard. Thus each entry for the keyboard launch is different and performs a slightly different action and the keyboard-specific icon is appropriate.

### Describe alternatives you've considered

_No response_

### Related issues

_No response_

### Keyman apps

- [ ] Keyman for Android
- [ ] Keyman for iPhone and iPad
- [ ] Keyman for Linux
- [ ] Keyman for macOS
- [x] Keyman for Windows
- [ ] Keyman Developer
- [ ] KeymanWeb
- [ ] Other - give details at bottom of form

### Keyman version

Any

### Operating system

Windows (Any)

### Device

Windows Laptop

### Target application

Start Menu

### Browser

N/A

### Keyboard name

Any

### Keyboard version

Any

### Language name

Any

### Additional context

_No response_