Gave BrightnessLEDs behaviour the correct name

LEDBehaviours.h

@@ -33,7 +33,7 @@ class BrightnessLEDs : public Behaviour {
   uint32_t _sat;
 
 public:
-  BrightnessLEDs(Adafruit_NeoPixel* strip, String name = "num_leds", uint32_t hue=0, uint32_t sat=0) :
+  BrightnessLEDs(Adafruit_NeoPixel* strip, String name = "brightness_leds", uint32_t hue=0, uint32_t sat=0) :
       Behaviour(name), _strip(strip), _hue(hue), _sat(sat){ }
   char* args() {return "<int brightness>"; };