Nuke room script doesn't completely remove matrix HQ

[rubo77]

Description

It seems like you end up with a corrupt matrix HQ room: every few days, the room reappears in your room list, but not correctly: the room has no name then. It is listed with the roomname just "$some_username and 487 others" or such and the URL is just like !cURbafjkfsMDVwdRDQ:matrix.org .
You can then leave the room again, but after a few days it will reappear again and again.

Steps to reproduce

• using postgresql use the nuke-room-from-db.sh script from my PR nuke-room-from-db.sh: added postgresql option and help #2337 on the "Matrix HQ" room
• This seems to really delete the room, and it will first disappear from your room list in Riot
• wait a few days

Version information

• Homeserver: my own homeserver
• Version: 0.26.0
• Install method: git clone/pip
• Platform:
  • Debian squeeze version 9.3
  • Hardware: Intel Core™ i7-6700 Quad-Core (Hetzner EX41S), running in a XEN vm/container (xen 4.6)
• Version of riot-web: 0.13.5

[richvdh]

nuke-room-from-db isn't supported.