Separate Neopixel followup (MarlinFirmware#19250)

Author: Bacon-Fixation

Marlin/src/feature/leds/neopixel.h

@@ -110,7 +110,7 @@ class Marlin_NeoPixel {
       #if CONJOINED_NEOPIXEL
         adaneo2.show();
       #else
-        TERN_(NEOPIXEL2_SEPARATE,adaneo1.setPin(NEOPIXEL2_PIN));
+        TERN(NEOPIXEL2_SEPARATE,,adaneo1.setPin(NEOPIXEL2_PIN));
         adaneo1.show();
         adaneo1.setPin(NEOPIXEL_PIN);
       #endif