Enable video-pagination and cameraQualityThresholds by default

One of the main issues in 2.2.x problem reports currently in the wild in social media and in the bbb admin groups seems to be that people turn a couple of webcams on and the clients or the server already can't handle it any more. In most cases, enabling video-pagination for mobile devices and also cameraQualityThresholds already "solves" the problem and makes it possible for much more students to attend online-class as well as raise acceptance of using BBB instead of other commercial services.
Even after promoting these new settings for weeks, many BBB operators still don't know of them and are surprised and happy once they enable it.
This change contians rather high values so that admins see that these features exist, but typical use cases which might not want video-pagination enabled (typical 28people school class) are still not "annoyed".