[BUG] Default tracker list added to sources instead of trackers

[niclimcy]

Describe the bug If the tracker list is added through the "Add to Paperback" button here: https://paperback-ios.github.io/trackers-main/main , trackers will be added to "External Sources" in settings rather than "External Trackers"

To Reproduce

1. Visit https://paperback-ios.github.io/trackers-main/main
2. Click "Add to Paperback" button
3. After Paperback is launched, a pop-up "Add as Source Repo" will show up
4. Trackers will show up as undefined in "External Sources"

Expected behaviour After clicking the "Add to Paperback" button, Paperback app should show "Add as External Tracker" and be added to External Trackers as intended

App Version Eg: v0.7-r38

Screenshots