Sets color of the country in selected state. The default color of the
selected country is the
same as the surface but brighter.
Default:
// the parameter can be a string like "#FF0000" or a hex number 0xFF0000
controller.setSelectedColor("#FF0000");
//controller.setSelectedColor(0xFF0000);
controller.setSelectedColor("#FF0000");
//controller.setSelectedColor(0xFF0000);