fix End Block Trais Changed bug

invesered trais before loading the cube scene

www/js/backend.js

@@ -227,7 +227,8 @@ function update() {
         }
         Block.Time -= (Date.now() - Block.last_time)
         Block.last_time = Date.now()
-        if (Block.Time <= 0){
+        if (Block.Time <= 0){// si le block est fini
+            trais = !trais; //empecher l'inversion du trais
             load_cube_scene()
         }