Replace fakeLogin() with actual login() method in AuthService and remove redundant fakeLogin() implementation.

frontend/src/app/shared-components/login/login.component.ts

@@ -53,8 +53,7 @@ export class LoginDialogComponent {
       return;
     }
     this.snackBar.open('Logging in...', '', {duration: 2000});
-    // this.authService.login(this.loginForm.value.code).subscribe({
-    this.authService.fakeLogin().subscribe({
+    this.authService.login(this.loginForm.value.code).subscribe({
       next: (jwt) => {
         this.dialogRef.close(jwt);
       },