Drop E element from `homing_feedrate_mm_s`

Marlin/src/module/motion.cpp

 int16_t feedrate_percentage = 100;
 
 // Homing feedrate is const progmem - compare to constexpr in the header
-const float homing_feedrate_mm_s[4] PROGMEM = {
+const float homing_feedrate_mm_s[XYZ] PROGMEM = {
   #if ENABLED(DELTA)
     MMM_TO_MMS(HOMING_FEEDRATE_Z), MMM_TO_MMS(HOMING_FEEDRATE_Z),
   #else
     MMM_TO_MMS(HOMING_FEEDRATE_XY), MMM_TO_MMS(HOMING_FEEDRATE_XY),
   #endif
-  MMM_TO_MMS(HOMING_FEEDRATE_Z), 0
+  MMM_TO_MMS(HOMING_FEEDRATE_Z)
 };
 
 // Cartesian conversion result goes here:

Marlin/src/module/motion.h

  * Feed rates are often configured with mm/m
  * but the planner and stepper like mm/s units.
  */
-extern const float homing_feedrate_mm_s[4];
+extern const float homing_feedrate_mm_s[XYZ];
 FORCE_INLINE float homing_feedrate(const AxisEnum a) { return pgm_read_float(&homing_feedrate_mm_s[a]); }
 
 extern float feedrate_mm_s;