fix close modal alert bug

Frontend/quizz-game/src/app/manage/manage.component.html

@@ -201,8 +201,9 @@
               <span class="text-sm font-medium"> Details </span>
             </a>
 
-            <form action="/logout">
+            <form>
               <button
+                routerLink="/login/sign-in"
                 type="submit"
                 class="flex w-full items-center gap-2 rounded-lg px-4 py-2 text-gray-500 hover:bg-gray-100 hover:text-gray-700"
               >

Frontend/quizz-game/src/app/manage/questions/list-questions/list-questions.component.ts

@@ -63,13 +63,14 @@ export class ListQuestionsComponent implements OnInit, OnDestroy {
     this.modalQuestion=false;
     this.questionEdited=null;
     this.alertDelete=false;
-    if(value !== "error"){
+    if(value !== "error" && value !== undefined){
       this.alertSuccess=value;
       this.addSuccess=true;
       setTimeout(() => {
         this.addSuccess = false;
       }, 5000);
-    }else{
+    }
+    if(value === "error"){
       this.errorOccured=true;
       setTimeout(() => {
         this.errorOccured = false;