feat(developer): the character map needs a longer delay before it autohides

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

I open the character map, start typing a search string and the map often autohides before I finish typing.

### Describe the solution you'd like

A longer delay, especially if I am typing in the search bar.

### 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
- [ ] Keyman for Windows
- [X] Keyman Developer
- [ ] KeymanWeb
- [ ] Other - give details at bottom of form

### Keyman version

16.0.145

### Operating system

Windows 11 22H2

### Device

Windows laptop

### Target application

_No response_

### Browser

_No response_

### Keyboard name

_No response_

### Keyboard version

_No response_

### Language name

_No response_

### Additional context

_No response_