Add MSSQL login processing fix for servers run on different locales.

This may no longer be an issue with better locale enforcement in OpenSimulator but it doesn't hurt to have this patch.
http://opensimulator.org/mantis/view.php?id=4680
Thanks to controlbreak for this

CONTRIBUTORS.txt

@@ -71,6 +71,7 @@ what it is today.
 * CharlieO
 * ChrisDown
 * Chris Yeoh (IBM)
+* controlbreak
 * coyled
 * Daedius
 * Dong Jun Lan (IBM)

OpenSim/Data/MSSQL/MSSQLManager.cs

@@ -104,6 +104,11 @@ namespace OpenSim.Data.MSSQL
             {
                 return SqlDbType.BigInt;
             }
+            if (type == typeof(DateTime))
+            {
+                return SqlDbType.DateTime;
+            }
+
             return SqlDbType.VarChar;
         }