Avoid comparing int and uint

ampel-firmware/led_effects.cpp

@@ -146,7 +146,7 @@ namespace led_effects {
     pixels.show();
   }
 
-  void showRainbowWheel(int duration_ms, uint16_t hue_increment) {
+  void showRainbowWheel(uint16_t duration_ms, uint16_t hue_increment) {
     if (config::night_mode) {
       return;
     }

ampel-firmware/led_effects.h

@@ -29,7 +29,7 @@ namespace led_effects {
   int countdownToZero();
   void showWaitingLED(uint32_t color);
   void showKITTWheel(uint32_t color, uint16_t duration_s = 2);
-  void showRainbowWheel(int duration_ms = 1000, uint16_t hue_increment = 50);
+  void showRainbowWheel(uint16_t duration_ms = 1000, uint16_t hue_increment = 50);
   void displayCO2color(uint16_t co2);
 }
 #endif