fix using wrong localStorage name for highscore

_src/assets/ts/snake.ts

@@ -7,7 +7,7 @@ let snake:number[][] = [[10, 10], [10, 11], [10, 12]];
 let snakedir:number = 2;
 let target:number[] = []
 let score:number = 0;
-let highscore:number = Number(localStorage.getItem("lastname"));
+let highscore:number = Number(localStorage.getItem("highscore"));
 let firstButtonPressed:boolean = false;
 
 function getRandomInt(max:number) {
@@ -77,7 +77,7 @@ function detectEnd(){
 
     if(gameFinished){
         if(highscore < score){
-            localStorage.setItem("lastname", String(score));
+            localStorage.setItem("highscore", String(score));
             alert("Game Over, your score: " + score + "\n This is your new highscore");
         } else {
             alert("Game Over, your score: " + score);