correct initialization of variable rgb[]

wled00/src/dependencies/espalexa/EspalexaDevice.cpp

@@ -122,7 +122,7 @@ uint32_t EspalexaDevice::getKelvin()
 uint32_t EspalexaDevice::getRGB()
 {
   if (_rgb != 0) return _rgb; //color has not changed
-  uint8_t rgb[4];
+  byte rgb[4]{0, 0, 0, 0}; 
   float r, g, b, w;
   
   if (_mode == EspalexaColorMode::none) return 0;