Properly references video points_view on close of VideoWrapperView.

Fixes #2649.

Summary of changes:
* Gets rid of all references to deprecated VideoPointsView.

@66eli77 please check this fixes #2649 
Eh? Eli made the same fix already, and it's in wch now: https://github.com/66eli77/ka-lite/commit/f571279f7e0508fef084f89c8819aad3805188e1