Fixes on RSSFeedList.test.js

flag=none

test plan:
  - Specs pass

qa risk: low

Change-Id: Ic5fc4ad2459c2dc2e61327f274d6dfd06ef94ca7
Reviewed-on: https://gerrit.instructure.com/c/canvas-lms/+/274406
Tested-by: Service Cloud Jenkins <svc.cloudjenkins@instructure.com>
Reviewed-by: Davis Hyer <dhyer@instructure.com>
QA-Review: Davis Hyer <dhyer@instructure.com>
Product-Review: Davis Hyer <dhyer@instructure.com>

jest/jest-setup.js

@@ -96,7 +96,6 @@ const ignoredErrors = [
   /The prop `currentUserRoles` is marked as required in `ObserverOptions`/,
   /The prop `dateTime` is marked as required in `FriendlyDatetime`/,
   /The prop `firstAnnouncement.id` is marked as required in `K5Announcement`/,
-  /The prop `focusLastElement` is marked as required in `RSSFeedList`/,
   /The prop `focusOnInit` is marked as required in `(FileUpload|TextEntry|UrlEntry)`/,
   /The prop `groupTitle` is marked as required in `(GroupMoveModal|GroupRemoveModal|SearchBreadcrumb)`/,
   /The prop `hasLoaded` is marked as required in `HistoryList`/,

ui/features/announcements/react/components/__tests__/RSSFeedList.test.js

@@ -25,7 +25,8 @@ const defaultProps = () => ({
   feeds: [],
   hasLoadedFeed: false,
   getExternalFeeds: () => {},
-  deleteExternalFeed: () => {}
+  deleteExternalFeed: () => {},
+  focusLastElement: () => {}
 })
 
 const defaultFeeds = () => [