Wal-Mart Still Sees Sales Up 1-3 Percent  CHICAGO (Reuters) - Wal-Mart Stores Inc. &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=WMT.N target=/stocks/quickinfo/fullquote"&gt;WMT.N&lt;/A&gt;, the  world's largest retailer, said on Saturday it still expects a 1  percent to 3 percent increase in December sales at its U.S.  stores open at least a year.