Updating < 3.1 savegame with not gamestart_valid results gamesetdefs set to "Internal"
If a savegame has gamestart_valid = FALSE, loading it does not set gamesetdef values for settings at all. This results even nondefault values to be defined as "Internal" default.
If a savegame has gamestart_valid = FALSE, loading it does not set gamesetdef values for settings at all. This results even nondefault values to be defined as "Internal" default.