LibTLS: Notify the client for app data as soon as some data is available

Previously we were waiting until the socket was no longer immediately
readable to notify the client, resulting in large buffers and longer
latency.

Userland/Libraries/LibTLS/Record.cpp

@@ -502,6 +502,8 @@ ssize_t TLSv12::handle_message(ReadonlyBytes buffer)
                 payload_res = (i8)Error::DecryptionFailed;
                 auto packet = build_alert(true, (u8)AlertDescription::DECRYPTION_FAILED_RESERVED);
                 write_packet(packet);
+            } else {
+                notify_client_for_app_data();
             }
         }
         break;