Fix switching back from alpha to beta

Currently when a user opts out of alpha they get thrown
into stable. Expected: they should get thrown back to beta.

NEVER assemble HTML tags by concatenating strings.
Broken by I7a2e05edfdc8f438c3e7e8a43edc0eeb0122c34d

Change-Id: I00fe4a41eb8eb59ece093aaa822393a4e7d40c91
Merge "Fix switching back from alpha to beta"