Unloaded tabs are not synced on Kiwi

### Describe the bug
Unloaded tabs (e.g. automatically unloaded to save memory or after browser launch) in Kiwi are not synced using tab sync.

### To Reproduce
Steps to reproduce the behavior:
1. Set up tab sync
2. Create new tabs and get them to unload (e.g. reopen Kiwi)
3. Start a push sync
4. Only active tabs appear

### Expected behavior
All tabs should be synced whether unloaded or not.

##### Desktop
- OS: Android
- Browser: Kiwi
- Browser Version: 98.0.4758.60
- Floccus version: 4.9.0
- Floccus sync method: Nextcloud Bookmarks

### Server
- OS: Alpine Linux Edge
- Nextcloud version: 23.0.1
- Bookmarks app version: 10.0.3

### Debug log
>It is often useful to provide a debug log file along with the issue. You can obtain a debug log of the most recent sync runs by clicking 'Debug log' in the bottom right corner of the floccus panel in your browser.

There is no button, and no sync error occured.

- [ ] Debug log provided