Sync notification can get stuck

### Checked for duplicates?

- [x] This issue is not a duplicate

### Does it also happen in the desktop version?

- [x] This bug does not occur in the latest version of Anki Desktop

### What are the steps to reproduce this bug?

I don't know. It just randomly happened. The notification was stuck for 10 days, then I removed the permission from AnkiDroid (and re-added it) and that made it go away.


Synching or pressing the "CANCEL" button did nothing. There was nothing wrong with my internet connection at the time, there was even a copy of this notification that showed up when I synched (and went away).

### Expected behaviour

The notification should disappear after the sync is done, or the "CANCEL" button is pressed.

### Debug info

```text
AnkiDroid Version = 2.22.3 (4f2ec681da36b8307a865f05192498b8425adf0f)
Backend Version = 0.1.60-anki25.07.5 (25.07.5 7172b2d26684c7ef9d10e249bd43dc5bf73ae00c)
Android Version = 13 (SDK 33)
ProductFlavor = play
Device Info = Xiaomi | POCO | mondrian | mondrian_global | 23013PC75G | qcom
Webview User Agent = Mozilla/5.0 (Linux; Android 13; 23013PC75G Build/TKQ1.220905.001; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/142.0.7444.171 Mobile Safari/537.36
ACRA UUID = 3792582f-98ac-430e-ae42-4ace0156bf29
FSRS = 4.1.1 (Enabled: true)
Crash Reports Enabled = true
```

### (Optional) Anything else you want to share?

Sorry for being late. Life got in the way.

### Research

- [x] I have checked the [manual](https://ankidroid.org/docs/manual.html) and the [FAQ](https://github.com/ankidroid/Anki-Android/wiki/FAQ) and could not find a solution to my issue
- [x] (Optional) I have confirmed the issue is not resolved in the latest alpha release ([instructions](https://docs.ankidroid.org/manual.html#betaTesting))