Fix some more missing #pragma onces (#20241)

keyboards/handwired/promethium/color.h

@@ -1,3 +1,5 @@
+#pragma once
+
 #define COLOR_BLANK       0, 0, 0
 
 #define COLOR_BLACK       0, 0, 0

keyboards/handwired/promethium/rgbsps.h

@@ -1,3 +1,5 @@
+#pragma once
+
 void rgbsps_set(uint8_t index, uint8_t r, uint8_t g, uint8_t b);
 void rgbsps_setall(uint8_t r, uint8_t g, uint8_t b);
 void rgbsps_turnoff(void);