Before resetting, clear the reboot schedule flag.

src/main/io/serial_msp.c

@@ -1861,6 +1861,10 @@ void mspProcess(void)
             waitForSerialPortToFinishTransmitting(candidatePort->port);
             stopMotors();
             handleOneshotFeatureChangeOnRestart();
+            // On real flight controllers, systemReset() will do a soft reset of the device,
+            // reloading the program.  But to support offline testing this flag needs to be
+            // cleared so that the software doesn't continuously attempt to reboot itself.
+            isRebootScheduled = false;
             systemReset();
         }
     }