Fix load check of a savegame with realistic braking enabled triggering signal checks on current game

src/settings_internal.h

@@ -34,6 +34,7 @@ enum SettingFlag : uint32 {
 	SF_RUN_CALLBACKS_ON_PARSE  = 1 << 17, ///< run callbacks when parsing from config file
 	SF_GUI_VELOCITY            = 1 << 18, ///< setting value is a velocity
 	SF_GUI_ADVISE_DEFAULT      = 1 << 19, ///< Advise the user to leave this setting at its default value
+	SF_ENUM_PRE_CB_VALIDATE    = 1 << 20, ///< Call the pre_check callback for enum incoming value validation
 };
 DECLARE_ENUM_AS_BIT_SET(SettingFlag)