Respect DISABLE_AXIS settings (PR#2216)

when DEFAULT_STEPPER_DEACTIVE_TIME is over
instead of simply turn off all.

Marlin/Marlin_main.cpp

@@ -6344,8 +6344,23 @@ void manage_inactivity(bool ignore_stepper_queue/*=false*/) {
   if (max_inactive_time && ms > previous_cmd_ms + max_inactive_time) kill(PSTR(MSG_KILLED));
 
   if (stepper_inactive_time && ms > previous_cmd_ms + stepper_inactive_time
-      && !ignore_stepper_queue && !blocks_queued())
+      && !ignore_stepper_queue && !blocks_queued()) {
-    disable_all_steppers();
+    #if DISABLE_X == true
+      disable_x();
+    #endif
+    #if DISABLE_Y == true
+      disable_y();
+    #endif
+    #if DISABLE_Z == true
+      disable_z();
+    #endif
+    #if DISABLE_E == true
+      disable_e0();
+      disable_e1();
+      disable_e2();
+      disable_e3();
+    #endif
+  }
 
   #ifdef CHDK // Check if pin should be set to LOW after M240 set it to HIGH
     if (chdkActive && ms > chdkHigh + CHDK_DELAY) {