Remove extra pragmas

Marlin/src/module/delta.h

@@ -25,8 +25,6 @@
  * delta.h - Delta-specific functions
  */
 
-#pragma once
-
 extern float delta_height,
              delta_endstop_adj[ABC],
              delta_radius,

Marlin/src/module/motion.h

@@ -27,7 +27,6 @@
  * High-level motion commands to feed the planner
  * Some of these methods may migrate to the planner class.
  */
-#pragma once
 
 #include "../inc/MarlinConfig.h"
 

Marlin/src/module/scara.h

@@ -25,8 +25,6 @@
  * scara.h - SCARA-specific functions
  */
 
-#pragma once
-
 #include "../core/macros.h"
 
 extern float delta_segments_per_second;