small tweak

linux/devices/startracker/StarTrackerHandler.cpp

@@ -275,6 +275,7 @@ void StarTrackerHandler::doStartUp() {
 void StarTrackerHandler::doShutDown() {
   // If the star tracker is shutdown also stop all running processes in the image loader task
   strHelper->stopProcess();
+  boot = false;
   setMode(_MODE_POWER_DOWN);
 }