R1:e1a8b5d3e904

Fix a bug where Phortune accounts created via "Create Account" would not have the viewer added as a member

Summary:
Ref T12451. When you explicitly created a second or third account or whatever, you wouldn't be added as a member.

(The editor sees that you're "already a member", so it doesn't add you.)

Test Plan:
- Go to `/phortune/`.
- Click "Switch Accounts".
- Click "Create Account".
- Create an account.
- Before patch: unable to view it since you don't get added as a member.
- After patch…