ui5-combobox: Enter key is not working

[2bno1]

Describe the bug
When there's item selected, press Enter key, the popover is not dismissed.

To reproduce
Steps to reproduce the behavior:

1. Go to https://sap.github.io/ui5-webcomponents/playground/components/ComboBox/
2. Input 'I', the popover is shown and first item (Item 1) is selected by default
3. Press Enter key, the popover is not dismissed

Expected behavior
If there's item selected, pressing Enter should dismiss the popover.

Screenshots

Context

• UI5 Web Components version
• OS/Platform: {...}
• Browser (if relevant): {...}
• Other information: {...}

Affected components
ui5-combobox