Delay allowing sticky modes

On bootup aux channels start out at default and allow sticky modes right away,
although they should only be allowed once they are actually not active.

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src/test/unit/flight_failsafe_unittest.cc

@@ -555,6 +555,11 @@ uint32_t millis(void)
     return sysTickUptime;
 }
 
+uint32_t micros(void)
+{
+    return millis() * 1000;
+}
+
 throttleStatus_e calculateThrottleStatus()
 {
     return throttleStatus;