increased GPS sat timeout from 1 second to 10 seconds

sending GPS sat information via a low-bandwidth link like the UM96 @ 9600 baud should also work at low frequencies like 0.2 Hz

src/ui/HSIDisplay.cc

@@ -1106,8 +1106,8 @@ void HSIDisplay::drawGPS(QPainter &painter)
         i.next();
         GPSSatellite* sat = i.value();
 
-        // Check if update is not older than 5 seconds, else delete satellite
-        if (sat->lastUpdate + 1000000 < currTime) {
+        // Check if update is not older than 10 seconds, else delete satellite
+        if (sat->lastUpdate + 10000000 < currTime) {
             // Delete and go to next satellite
             gpsSatellites.remove(i.key());
             if (i.hasNext()) {