[Account Recovery][PM-18721] fix type errors

libs/auth/src/angular/input-password/input-password.component.ts

@@ -653,7 +653,7 @@ export class InputPasswordComponent implements OnInit {
     this.platformUtilsService.copyToClipboard(value, { window: window });
     this.toastService.showToast({
       variant: "info",
-      title: null,
+      title: "",
       message: this.i18nService.t("valueCopied", this.i18nService.t("password")),
     });
   }