Mobile Virtual Keyboard won't trigger `text_entered` signal.

### Tested versions

3.x

### System information

mobile web

### Issue description

When entering text and pressing the "enter" key on the virttual keyboard, it stays open, and wont trigger text_entered() signal.

### Steps to reproduce

connect the text_entered() signal to a OS.alert("OK") and try to trigger it by writing text and pressing "enter" on web mobile.

### Minimal reproduction project (MRP)

```gdscript
func _on_LineEdit_text_entered(new_text):
OS.alert("OK")
```

_Production edit: formatted code_

Reproduce the issue on mobile web using the provided LineEdit text_entered() handler and the minimal GDScript example. Verify whether pressing Enter on the virtual keyboard leaves the keyboard open and fails to emit the signal; done means the signal fires and the reported behavior is corrected.

Written by the indexing model from the issue text.