Fix addStop to work as slot again

In order to call this as slot it needs to have defaults for all arguments.
So we need to change the gasmix into a pointer - which is actually better
as this allows to easily pass a NULL pointer when we want to continue to
use the previous gas.

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

qt-ui/profile/profilewidget2.cpp

@@ -605,8 +605,7 @@ void ProfileWidget2::mouseDoubleClickEvent(QMouseEvent *event)
 
 		int minutes = rint(timeAxis->valueAt(mappedPos) / 60);
 		int milimeters = rint(profileYAxis->valueAt(mappedPos) / M_OR_FT(1, 1)) * M_OR_FT(1, 1);
-		struct gasmix ignore = { 0 };
-		plannerModel->addStop(milimeters, minutes * 60, ignore, 0, true, true);
+		plannerModel->addStop(milimeters, minutes * 60, 0, 0, true);
 	}
 }