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

quantum/visualizer/default_animations.h

@@ -14,8 +14,7 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#ifndef DEFAULT_ANIMATIONS_H_
-#define DEFAULT_ANIMATIONS_H_
+#pragma once
 
 #include "visualizer.h"
 
@@ -26,5 +25,3 @@ extern keyframe_animation_t default_suspend_animation;
 // An animation for testing and demonstrating the led support, should probably not be used for real world
 // cases
 extern keyframe_animation_t led_test_animation;
-
-#endif /* DEFAULT_ANIMATIONS_H_ */