qhy: revert recent change to interrupt exposures when the stop button is clicked
qhy: revert recent change to interrupt exposures when the stop button is clicked

OpenPHDGuiding/phd2,OpenPHDGuiding/phd2,OpenPHDGuiding/phd2,OpenPHDGuiding/phd2,OpenPHDGuiding/phd2,OpenPHDGuiding/phd2