[DSC-648] Fix circular dependency

Author: Davide Negretti

src/app/submission/edit/pending-changes/pending-changes.guard.ts

@@ -7,10 +7,6 @@ import { switchMap } from 'rxjs/operators';
 import { SubmissionEditCanDeactivateService } from '../submission-edit-can-deactivate.service';
 import { ThemedSubmissionEditComponent } from '../themed-submission-edit.component';
 
-export interface PendingChangesGuardComponentInterface {
-  canDeactivate: (id: string) => boolean | Observable<boolean>;
-}
-
 @Injectable({
   providedIn: 'root'
 })

src/app/submission/edit/submission-edit-can-deactivate.service.ts

@@ -4,9 +4,12 @@ import { ActivatedRoute, Router } from '@angular/router';
 import { combineLatest, Observable } from 'rxjs';
 import { map } from 'rxjs/operators';
 
-import { PendingChangesGuardComponentInterface } from './pending-changes/pending-changes.guard';
 import { SubmissionService } from '../submission.service';
 
+interface PendingChangesGuardComponentInterface {
+  canDeactivate: (id: string) => boolean | Observable<boolean>;
+}
+
 @Injectable({
   providedIn: 'root'
 })