[ENG-10695] Non-spam deleted items showing as spam (#921)

- Ticket: [ENG-10695]
- Feature flag: n/a

## Summary of Changes
1. Changed check to flagged content.

Author: nsemets

src/app/features/preprints/services/preprints.service.ts

@@ -100,7 +100,7 @@ export class PreprintsService {
       .pipe(
         map((response) => PreprintsMapper.fromPreprintWithEmbedsJsonApi(response)),
         catchError((error) => {
-          if (error.status === 410) {
+          if (error.error?.errors?.[0]?.meta?.flagged_content) {
             this.router.navigate(['/spam-content']);
           }
           return throwError(() => error);

src/app/shared/services/resource.service.ts

@@ -63,7 +63,7 @@ export class ResourceGuidService {
       ),
       finalize(() => this.loaderService.hide()),
       catchError((error) => {
-        if (error.status === 410) {
+        if (error.error?.errors?.[0]?.meta?.flagged_content) {
           this.router.navigate(['/spam-content']);
         }
         return throwError(() => error);