Merge branch 'disable-unread-dm-count' into 'master'

Disable unread DM count since it doesn't correctly represent unreads in the feed-like DM view.

See merge request !45
2 jobs for master in 16 minutes and 55 seconds (queued for 4 seconds)
Status Job ID Name Coverage
  Test
passed #160796
lint_and_test

00:10:23

 
  Build
passed #160797
build

00:06:31