gregistrysettings: bump key name length to 128
gregistrysettings: bump key name length to 128

32 is just too low for key names, specially since the registry has a limit
of 16,383 chars. Giving that, 128 is a good bump for now.

endlessm/glib,endlessm/glib,endlessm/glib,endlessm/glib,endlessm/glib