Majority of all time is `Windows Default Lock Screen`

- [x] I am on the [latest](https://github.com/ActivityWatch/activitywatch/releases/latest) ActivityWatch version.
- [x] I have searched the issues of this repo and believe that this is not a duplicate.

- **OS name and version**: Windows 10
- **ActivityWatch version**: `v0.12.2` (Just updated to `v0.13.1` however)

## Describe the bug

The grand majority of the item activity watch records is `Windows Default Lock Screen`. This seems less than ideal, and I can't seem to permanently "exclude it" from visualizations & calculations so it just never shows up.


## To Reproduce

Unknown

## Expected behavior
This doesn't show