Updated App styling - fixes #2085 fixes #2167

Some updates to app styling

Designer
* Reload the designer, the phone will not start shrinked and expand to fit the app
* It will start expanded

Published App
* Short apps (like one button) now no longer scroll on a device
* App loading overlay now covers the entire app (no gaps)
* Remix panel is scrollable on a device and covers entire app
* Remix panel popups are scrollable and cover entire app

Need to test this still on real devices, which I have in the office.