[SearchBox mode=tag] Backspacing on ongoing search should not delete all previously selected keywords

**Affected Projects**
React

**Library Version:** latest v4

**Describe the bug**
When a user has already selected search keywords using the `searchBox` when he starts typing a new word and decides to delete it, all previously selected keywords are removed.

**To Reproduce**
Test component: https://reactivesearch-react.vercel.app/?path=/story/search-components-searchbox--with-mode-prop
Steps to reproduce the behavior:
- Search for paradise
- select paradise
- Search for Potter
- select harry potter
- Type 'pot'
- backspace to delete up to the begining of the search bar

**Expected behavior**
All previously selected search keywords should be kept

**Screenshots**
(https://www.loom.com/share/50cbaf501e31487d87330239194aa851?sid=f36d990b-8c97-4790-bd8b-d9d399e020c0)

- Browser Chrome
- Version: 117