Skirmish select map menu do not save the last played mission map as the default selection.

[AdrianeYves]

The issue here is that testing mission maps with this kind of behavior is irritating at best.
I've been creating missions for ages, and this is one of the issues I really want to get fixed. Until now, this problem has persisted—yet it can easily be resolved with an edit to MapUtil.cpp.

//-------------------------------------------------------------------------------------------------
/** Validate a map */
//-------------------------------------------------------------------------------------------------
Bool isValidMap( AsciiString mapName, Bool isMultiplayer )
{
	if(!TheMapCache || mapName.isEmpty())
		return FALSE;
	TheMapCache->updateCache();

	mapName.toLower();
	MapCache::iterator it = TheMapCache->find(mapName);
	if (it != TheMapCache->end())
	{
		// if (isMultiplayer == it->second.m_isMultiplayer) -- commenting this out to make it work
		// {
			return TRUE;
		// }
	}

	return FALSE;
}  // end isValidMap

Please apply this fix thanks!