Search unexpectedly fails for some strings

### What Happened?

When searching for the Flatpak app "CherryTree", entering "Cherry" failed to find it. However, entering "Cherr" or Cherryt" found the app OK. This could cause a user to believe an app was not available when it is.

### Steps to Reproduce

1. Open AppCenter and search for "Cherry". CherryTree app is not listed.
2. Search for "Cherr" or Cherryt" or "tree". The app is listed.

### Expected Behavior

The search should work for all reasonable substrings of the app name.

### OS Version

8.x (Circe)

### Session Type

Secure Session (Wayland)

### Software Version

Latest release (I have run all updates)

### Log Output

_No response_

### Hardware Info

_No response_