Codechange: use setting name instead of index for CmdChange(Company)Setting (#9306)

This is mostly done as there are now constraints on settings.ini you might not
expected. For example, conditional settings always have to come last, as otherwise
they would influence the index.

src/script/api/script_group.cpp

@@ -118,7 +118,7 @@
 {
 	if (HasWagonRemoval() == enable_removal) return true;
 
-	return ScriptObject::DoCommand(0, ::GetCompanySettingIndex("company.renew_keep_length"), enable_removal ? 1 : 0, CMD_CHANGE_COMPANY_SETTING);
+	return ScriptObject::DoCommand(0, 0, enable_removal ? 1 : 0, CMD_CHANGE_COMPANY_SETTING, "company.renew_keep_length");
 }
 
 /* static */ bool ScriptGroup::HasWagonRemoval()