Fix typo in `aos/events/simulated_network_bridge.cc`

I noticed this while writing a test for fixing an operation check
crash when map data from the front went stale.

Change-Id: Ie68f89baa477551f717e0abfaad84cfe64ba3280
Signed-off-by: James Kuszmaul <james.kuszmaul@bluerivertech.com>
diff --git a/aos/events/simulated_network_bridge.cc b/aos/events/simulated_network_bridge.cc
index c8a8150..3ed39fa 100644
--- a/aos/events/simulated_network_bridge.cc
+++ b/aos/events/simulated_network_bridge.cc
@@ -234,7 +234,7 @@
       // channel within the same callback.
       LOG(WARNING) << "Not forwarding message on "
                    << configuration::CleanedChannelToString(fetcher_->channel())
-                   << " because we aren't running.  Set at "
+                   << " because we aren't running.  Sent at "
                    << fetcher_->context().monotonic_event_time << " now is "
                    << fetch_node_factory_->monotonic_now();
       sent_ = true;