Fixed errcheck issues in server/channels/app/permissions.go (#29064)

Co-authored-by: Ben Schumacher <ben.schumacher@mattermost.com>

server/.golangci.yml

@@ -89,7 +89,6 @@ issues:
         channels/app/helper_test.go|\
         channels/app/import_functions.go|\
         channels/app/integration_action.go|\
-        channels/app/permissions.go|\
         channels/app/permissions_test.go|\
         channels/app/platform/helper_test.go|\
         channels/app/platform/license.go|\