* Apply iOS status bar padding only to fullscreen views

Previously padding was applied to account for the status bar, whether in
standard or expanded 'in-call' geometry only if the current view was not
a subview of a containing view. This didn't cover the case of root views
embedded in other windows (e.g. dialogs).

We also ensure that the window is fullscreen to account for cases like
small dialogs centred on the screen.

* Do not apply padding if we're a subview in a containing view