[Rescue people] missing asset for Haar cascade filter to detect human faces

[jmplaza]

"RoboticsAcademy/exercises/static/exercises/rescue_people_react/haarcascade_frontalface_default.xml" should be copied to "RoboticsAcademy/exercises/static/exercises/rescue_people/haarcascade_frontalface_default.xml" in order to get the classic version of this exercise also operative. It was wrongly removed some time ago.

[ango1994]

Closed on #2140