Dont highlight search term if search field is emptied

[tobysoby]

Description

When I search for something and delete the search term from the search field, the search term doesn't stay highlighted in the editor panel.

Issue fixed

Deleted search term stays highlighted · Issue #3111 · BoostIO/Boostnote · GitHub

Type of changes

• 🔘 Bug fix (Change that fixed an issue)
• ⚪ Breaking change (Change that can cause existing functionality to change)
• ⚪ Improvement (Change that improves the code. Maybe performance or development improvement)
• ⚪ Feature (Change that adds new functionality)
• ⚪ Documentation change (Change that modifies documentation. Maybe typo fixes)

Checklist:

• 🔘 My code follows the project code style
• ⚪ I have written test for my code and it has been tested
• 🔘 All existing tests have been passed
• ⚪ I have attached a screenshot/video to visualize my change if possible

[ZeroX-DG]

LGTM 🎉