Save/load changes for timetable_separation_rate setting.

src/table/settings.ini

@@ -355,7 +355,6 @@ patxname = ""auto_timetables.order.timetable_separation""
 base     = GameSettings
 var      = order.timetable_separation_rate
 type     = SLE_UINT8
-from     = TIMESEP_SV
 def      = 100
 min      = 0
 max      = 100
@@ -364,6 +363,8 @@ str      = STR_CONFIG_SETTING_TIMETABLE_SEPARATION_RATE
 strhelp  = STR_CONFIG_SETTING_TIMETABLE_SEPARATION_RATE_HELPTEXT
 strval   = STR_CONFIG_SETTING_PERCENTAGE
 cat      = SC_EXPERT
+extver   = SlXvFeatureTest(XSLFTO_AND, XSLFI_AUTO_TIMETABLE)
+patxname = ""auto_timetables.order.timetable_separation_rate""
 
 ; There are only 21 predefined town_name values (0-20), but you can have more with newgrf action F so allow
 ; these bigger values (21-255). Invalid values will fallback to english on use and (undefined string) in GUI.