Change include guards in quantum/ to pragma once (#11239)

quantum/rgblight.h

@@ -13,8 +13,8 @@
  * You should have received a copy of the GNU General Public License
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
-#ifndef RGBLIGHT_H
-#define RGBLIGHT_H
+
+#pragma once
 
 /***** rgblight_mode(mode)/rgblight_mode_noeeprom(mode) ****
 
@@ -437,4 +437,3 @@ void rgblight_effect_twinkle(animation_status_t *anim);
 #    endif
 
 #endif  // #ifndef RGBLIGHT_H_DUMMY_DEFINE
-#endif  // RGBLIGHT_H