bug(web): Longpress on spacebar gives a very wide longpress menu which looks rather strange

### Describe the bug

While long pressing the Spacebar key in the Khmer Angkor keyboard, there is an extra (without caption) space bar appears over the actual keyboard.

### Reproduce the bug

1. Install Keyman 17.0.13 Alpha build.
2. Open Keyman In-app.
3. Verify EuroLatin (SIL) Keyboard appears as the default keyboard.
4. Long press any letters in the Keyboard.
5. Verify the long press key of any letter works.
6. Long press Space bar key.
7. Verify no it does not show up anything.
8. Download and install Khmer Angkor Keyboard.
9. Switch to Khmer Angkor Keyboard.
10. Long press the Space bar key.

Here, I noticed that an extra spacebar key appears upon the actual spacebar key. Seems to be an issue.

..Extra space bar while long pressing the Khmer Angkor keyboard

### Expected behavior

1. While long pressing the Spacebar key, it should not show up another empty keyboard over the actual keyboard. (in Khmer Angkor Keyboard)

### Related issues

_No response_

### Keyman apps

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

### Keyman version

17.0.13

### Operating system

iOS 15.0

### Device

iPhone 12 Pro Max Simulator, iPad Air (4 generation)

### Target application

Keyman In-App

### Browser

_No response_

### Keyboard name

khmer_angkor

### Keyboard version

1.3

### Language name

Khmer

### Additional context

_No response_