use mrand in baground

inc/canvas/BackGround.hpp

@@ -1,11 +1,9 @@
 #include <vector>
 
-#include "values/RandBuffer.hpp"
 #include "canvas/Sun.hpp"
 
 #include <raylib.h>
 
-
 struct Moon
 {
   float x;
@@ -31,8 +29,6 @@ private:
 
   Sun sun;
 
-  RandBuffer starBuff;
-  RandBuffer mountenBuff;
   Moon m_moon;
   int colorSet;
   int time;