Apply #pragma once, misc cleanup (#12322)

* Apply #pragma once in headers
* Adjust some thermistors formatting
* Misc cleanup and formatting

Marlin/src/module/planner_bezier.h

@@ -19,6 +19,7 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  *
  */
+#pragma once
 
 /**
  * planner_bezier.h
@@ -27,10 +28,8 @@
  *
  */
 
-#ifndef PLANNER_BEZIER_H
-#define PLANNER_BEZIER_H
-
-#include "../inc/MarlinConfig.h"
+#include <stdint.h>
+#include "../core/macros.h"
 
 void cubic_b_spline(
               const float position[NUM_AXIS], // current position
@@ -39,5 +38,3 @@ void cubic_b_spline(
               float fr_mm_s,
               uint8_t extruder
             );
-
-#endif // PLANNER_BEZIER_H