Minor code cleanup, move NUM_AXIS out of config

Marlin/example_configurations/WITBOX/Configuration.h

@@ -521,8 +521,10 @@ const bool Z_MAX_ENDSTOP_INVERTING = true; // set to true to invert the logic of
   //#define MANUAL_Z_HOME_POS 402 // For delta: 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 {120*60, 120*60, 7.2*60, 0}  // set the homing speeds (mm/min)
 
 // default settings