Progress icon persists if force closed

[ZimCodes]

Description

When the app is in the process of clearing caches, an icon appears on the user's device indicating the current progress. If the user force closes all apps (or just the Settings app), the app would correctly stop clearing caches, but the icon showing the progress persists indefinitely unless the user resets their device.

Steps to reproduce

1. Open app
2. Select any of the 3 options (I chose Clean Cache of User Apps)
3. Select any 3+ from the list of apps, services, and processes
4. Select the broom button to start.
5. While the app clears the caches, open your app switcher and force close all apps (or just the Settings app).
6. For now on, the progress icon will stay on your screen indefinitely, unless you reset your device.

Correct Behavior

If the user force closes the settings app while the cache cleaner app is active, the progress icon should no longer persist.