fix: sd-combobox prevents user from editing text after tab

[martascorreia]

Current behavior

In the 'sd-combobox' component, if you write something and click tab after, you can not delete the text you wrote. It stays in the background even if you write and delete something else on top of it, like a placeholder.

Expected behavior

It should either delete the text after tab or let you edit it again.

Steps to reproduce

1. Go to Components -> sd-combobox -> Docs -> default use case
2. Click the sd-combobox and write something
3. Click tab
4. Try to delete the text you wrote

Technical Information

DoR

• Item has business value
• Item has been estimated by the team
• Item is clear and well-defined
• Item dependencies have been identified