feat(mac): Support Icons in macOS Taskbar Keyboard Selector Menu

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

I suspect that the keyman team is already tracking this and I failed to find the issue. Reporting as a feature request and not a bug , I'm sure the team is already planning to restore the feature when macOS permits.

The keyboard icons that would appear alongside a keyboard label, in the "Keyman" section of the macOS keyboard selector no longer appear as of KM17. The region with the missing icons is highlighted in the attached image:


### Describe the solution you'd like

icons!

### Describe alternatives you've considered

imagining icons.

### Related issues

_No response_

### Keyman apps

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

### Keyman version

17.0.325

### Operating system

macOS 14.5

### Device

_No response_

### Target application

Mac Book

### Browser

_No response_

### Keyboard name

Any

### Keyboard version

Any

### Language name

Any

### Additional context

_No response_