[BUG] Feed group deletion does not update UI

[geominorai]

Describe the bug

Deleting a feed group in the Groups tab does not update the UI. This includes the current Groups tab and the Home row buttons. Attempting to open the deleted group results in an error.

This also allows for the unfortunate scenario of being locked out of settings caused by deleting the feed group when only Trending is the only other enabled Home row tab, which does not have a button to open settings, or the more deliberate selecting of the deleted custom feeds as the only two Home row tabs, thus crashing the app immediately on startup.

To Reproduce

Steps to reproduce the behavior:

1. Go to Groups tab in the home row
2. Press and hold a feed group to edit
3. Delete the group
4. Close edit window
5. See error

Screenshots

Device

Model: Samsung Galaxy S9+
OS: Android 10
Language: English
Fritter Version: v3.0.0-beta6+300000772
CI Build: 7203e69

[geominorai]

Possible regression of #163.