Add option to disallow filament change without homing first

Marlin/Marlin_main.cpp

@@ -9265,10 +9265,10 @@ inline void gcode_M503() {
    */
   inline void gcode_M600() {
 
-    // Don't allow filament change without homing first
-    if (axis_unhomed_error()) {
-        home_all_axes();
-    }
+    #if ENABLED(HOME_BEFORE_FILAMENT_CHANGE)
+      // Don't allow filament change without homing first
+      if (axis_unhomed_error()) home_all_axes();
+    #endif
 
     // Initial retract before move to filament change position
     const float retract = parser.seen('E') ? parser.value_axis_units(E_AXIS) : 0