Fix overlay bounds to mask events after window resize

[banjun]

on 2.0.3 tag, the overlay is not autoresized while HUD is dismissed.

example steps to reproduce:

1. setDefaultMaskType to .Black
2. show and dismiss HUD in portrait screen
3. make the device landscape while HUD is dismissed
4. show HUD in landscape screen
5. on right side of the window, user interactions are pass through to views below.

at step 5, the overlay.frame is still portrait because autoresizing is happened while the overlay is not in the window view hierarchy.

this is also reproducible on multitasking split view.

[honkmaster]

Should be fixed on master.

[banjun]

I have confirmed that this issue is resolved on master.
ce1b21f#diff-a9f291dcb26df32018013622ccd7783dR1250

But I wonder it is correct fix in terms of layout, the way resetting frame on every overlayView getter call.
As you still use _overlayView.autoresizingMask, I think manual resetting frame just before addSubview: overlayView is enough.