Save/Restore leveling on toolchange for singlenozzle too (#17682)

Marlin/src/module/tool_change.cpp

     const uint8_t old_tool = active_extruder;
     const bool can_move_away = !no_move && !idex_full_control;
 
-    #if HAS_LEVELING && DISABLED(SINGLENOZZLE)
+    #if HAS_LEVELING
       // Set current position to the physical position
       TEMPORARY_BED_LEVELING_STATE(false);
     #endif