Minor code cleanup, move NUM_AXIS out of config

Marlin/example_configurations/SCARA/Configuration.h

@@ -551,8 +551,10 @@ const bool Z_MAX_ENDSTOP_INVERTING = true; // set to true to invert the logic of
   #define MANUAL_Z_HOME_POS 0.1  // Distance between nozzle and print surface after homing.
 #endif
 
-//// MOVEMENT SETTINGS
-#define NUM_AXIS 4 // The axis order in all axis related arrays is X, Y, Z, E
+/**
+ * MOVEMENT SETTINGS
+ */
+
 #define HOMING_FEEDRATE {40*60, 40*60, 10*60, 0}  // set the homing speeds (mm/min)
 
 // default settings