Mesh data not saved after autolevel about marlin

[ritchiedc]

In Creality's original code a call to "settings.save()" is made in G29.cpp at line 853. This is missing from G29.cpp at line 768. To avoid having to include "settings.h" in G29.cpp the call to settings.save() can be added to the DWINTouch_bedlevel_finish_callback().

Edit: If you want the screen initiated autolevel to save but the G29 command from something like Octoprint to not save and require an M500 put the settings.save() call inside the check for 3 == waitway in the callback function.