Unread badge counter is not refreshed when unfollowing planet

[rex4539]

Planet 0.19.4 (2282)

Reproducibility: always

Steps:

1. Follow a planet with blog posts.
2. Without reading any blog posts, unfollow the planet.

What happened:
Planet is unfollowed but the unread badge counter under the Smart Feeds is not refreshed.

Expected result:
Planet is unfollowed and the unread badge counter under the Smart Feeds is refreshed.

[rex4539]

Now the bug is of a different nature.

The unread count in the smart feeds is automatically zero, even though you just followed a planet with unread posts.

[livid]

The total unread count is updated when checking for updates or unfollowing, but it is not updated during the initial follow. I'll fix it next. Thanks a lot!