passing int to Timer constructor as specified by API on non-openfl or flash targets

Without this, there is this compilation error:
/usr/lib/haxe/lib/Actuate/1,6,8/motion/actuators/SimpleActuator.hx:75: characters 22-31 : Float should be Int
/usr/lib/haxe/lib/Actuate/1,6,8/motion/actuators/SimpleActuator.hx:75: characters 22-31 : For function argument 'time_ms'