Use 0 as the bed height for manual probing

Marlin/ultralcd.cpp

@@ -1895,7 +1895,7 @@ void kill_screen(const char* lcd_msg) {
       if (!lcd_wait_for_move) {
         #if MANUAL_PROBE_HEIGHT > 0 && DISABLED(MESH_BED_LEVELING)
           // Display "Done" screen and wait for moves to complete
-          line_to_z(Z_MIN_POS + MANUAL_PROBE_HEIGHT);
+          line_to_z(MANUAL_PROBE_HEIGHT);
           lcd_synchronize(PSTR(MSG_LEVEL_BED_DONE));
         #endif
         lcd_goto_previous_menu_no_defer();