HOME_BEFORE_FILAMENT_CHANGE on any axis unknown (#17681)

Marlin/src/gcode/feature/pause/M600.cpp

 
   #if ENABLED(HOME_BEFORE_FILAMENT_CHANGE)
     // Don't allow filament change without homing first
-    if (axes_need_homing()) home_all_axes();
+    if (!all_axes_known()) home_all_axes();
   #endif
 
   #if EXTRUDERS > 1