Block visibility settings have summary duplicated in the title

tim.plunkett → credited lauriii → .

Crediting @lauriii who found the bug. NW for tests

This is visually a very bad regression, so I think we should commit the quick fix and add some general test coverage for block visibility vertical tabs in 📌 Write functional javascript test for block visibility vertical tabs Active - presumably we have none otherwise this would have been caught.

Moving to RTBC, let's add more comprehensive coverage in the other issue.

I agree with catch that due to the severity of this visual regression that the fix should be in the release without a test. I may also use this as an opportunity to write my first FunctionalJS test, who knows!

Committed to 11.x and cherry-picked to 11.1.x 10.5.x 10.4.x

Thanks!