Android search only looks in one account

### Which version of floccus are you using?

4.17.1

### Sync method

WebDAV

### Which browser are you using? In case you are using the phone App, specify the Android or iOS version and device please.

Android

### Which version of Nextcloud Bookmarks are you using? (if relevant)

_No response_

### Which version of Nextcloud? (if relevant)

_No response_

### What kind of WebDAV server are you using? (if relevant)

_No response_

### Describe the Bug

There is no way to search across all accounts.

Related to #1294 and #1296, forcing the user to remember which account a bookmark was in, defeats the purpose of "search".

### Expected Behavior

As above.

### To Reproduce

As above.

### Debug log provided

- [ ] I have provided a debug log file