Codechange: merge guiflags and flags in settings .ini files

It was rather confusing which one was for what, especially as some
SaveLoad flags were settings-only. Clean up this mess a bit by
having only Setting flags.

src/script/api/script_gamesettings.cpp

@@ -35,7 +35,7 @@
 
 	const SettingDesc *sd = GetSettingFromName(setting);
 
-	if ((sd->save.conv & SLF_NO_NETWORK_SYNC) != 0) return false;
+	if ((sd->flags & SF_NO_NETWORK_SYNC) != 0) return false;
 
 	return ScriptObject::DoCommand(0, 0, value, CMD_CHANGE_SETTING, sd->name);
 }