clearing the search box should clear search results.

### Steps to reproduce

1. Search a room for messages
2. Clear the search field
3. Room is stuck showing a spinner and 'no results'

### Outcome

#### What did you expect?

Room should go back to normal timeline

#### What happened instead?

Stuck in blank search results until you explicitly hit the (x) button

### Operating system

_No response_

### Application version

Element Nightly version: 2024110501 Crypto version: Rust SDK 0.7.2 (517d99b), Vodozemac 0.7.0

### How did you install the app?

_No response_

### Homeserver

_No response_

### Will you send logs?

No