Launched sim doesn't go inside the game

[KatieWoe]

For ES6 Testing. Phet-io on master
When in studio, if you launch from within a level in the game then the launched sim will be in the level select menu, not the level itself.

[jbphet]

While I am indeed the responsible developer, I haven't been involved at all with the phet-io work on this sim. Looking back through the commit history, it looks like @chrisklus and @zepumph have been doing this, so I'll assign to them, and they can sort out if this should be addressed and, if so, who should take care of it.

[marlitas]

PhET-iO will not be part of the upcoming region and culture publication. I am labeling as deferred.