MotionPathActuator not checking correctly for HTML5 Properties

[gddhag]

The SimpleActuator does this check in initialize:
Reflect.hasField (target, propertyName) #if flash && !untyped (target).hasOwnProperty ("set_" + propertyName) #elseif html5 && !(untyped (target).properties && untyped (target).properties["set_" + propertyName]) #end

to determine wether it has to use a setter or not
the MotionPathActuator just checks for:
#if flash false && #end Reflect.hasField (target, propertyName)