tweak alert for malicious file download

currently when the user downloads a malicous file they are giving a warning and the option to keep or discard but if the user isn’t paying attention then they may click keep without eve realizing that there was a warning. if the user downloads a malcious file the keep button should be greyed out and unclickable until the user clicks a tick box that says proceed anyway and then the keep button becomes clickable. also dragon could offer to scan the file with virus total, valkery and cima if the user feels it may be a false positive