Add setup mouse sensitivity on head

Author: scriptsengineer

fps/fps_controller_3d.gd

@@ -27,7 +27,10 @@ class_name FPSController3D
 @export_group("Mouse")
 
 ## Mouse Sensitivity
-@export var mouse_sensitivity := 2.0
+@export var mouse_sensitivity := 2.0:
+	set(value):
+			if head != null:
+				head.mouse_sensitivity = value
 
 ## Maximum vertical angle the head can aim
 @export var vertical_angle_limit := 90.0