fix: Avoid hanging when capture device permissions denied on macOS. #300
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This would happen e.g. on activating screen capture, but then denying permissions for it in the popup dialog. This doesn't exactly hang the program, but prevents any further changes to the capture device setting, and will hang the program on shutdown (in the destructor of the camera device).
The drive-by cleanups seem to have fixed the crash when changing video devices as well.
This change is