Change: Fix errcheck issues in server/channels/app/platform/session_test.go (#29376)

server/.golangci.yml

@@ -105,7 +105,6 @@ issues:
         channels/app/platform/service.go|\
         channels/app/platform/service_test.go|\
         channels/app/platform/session.go|\
-        channels/app/platform/session_test.go|\
         channels/app/platform/status.go|\
         channels/app/platform/web_broadcast_hook.go|\
         channels/app/platform/web_conn.go|\