removed IRAM_ATTR from inlined function

when the function is inlined into a IRAM_ATTR function, it will also reside in IRAM. Forced inlining is recommended by Espressif if I understand this correctly: https://docs.espressif.com/projects/esp-idf/en/stable/esp32/api-guides/hardware-abstraction.html

wled00/FX_fcn.cpp

@@ -1884,7 +1884,7 @@ bool WS2812FX::deserializeMap(uint8_t n) {
   return (customMappingSize > 0);
 }
 
-__attribute__ ((always_inline)) inline uint16_t IRAM_ATTR WS2812FX::getMappedPixelIndex(uint16_t index) const {
+__attribute__ ((always_inline)) inline uint16_t WS2812FX::getMappedPixelIndex(uint16_t index) const {
   // convert logical address to physical
   if (index < customMappingSize
     && (realtimeMode == REALTIME_MODE_INACTIVE || realtimeRespectLedMaps)) index = customMappingTable[index];