SVB cameras: improved stability when changing ROI or binning (#970)
SVB cameras: improved stability when changing ROI or binning (#970)

When changing ROI or binning, PHD2 was calling SVBStopVideoCapture
which would sometimes hang. Removing the call makes capturing more
stable, and ROI and binning change continues to work as expected
without the call.
OpenPHDGuiding/phd2,OpenPHDGuiding/phd2,OpenPHDGuiding/phd2,OpenPHDGuiding/phd2,OpenPHDGuiding/phd2,OpenPHDGuiding/phd2