remove NotWorking category from the passing tests

svn path=/trunk/mcs/; revision=72640

mcs/class/System.Data/Test/System.Data/DataSetTest2.cs

@@ -2130,7 +2130,6 @@ namespace MonoTests_System.Data
 		}
 
 		[Test]
-		[Category ("NotWorking")]
 		public void ReadXml_Strg()
 		{
 			string sTempFileName = "tmpDataSet_ReadWriteXml_43894.xml"  ;
@@ -2169,7 +2168,6 @@ namespace MonoTests_System.Data
 		}
 
 		[Test]
-		[Category ("NotWorking")]
 		public void ReadXml_Strm()
 		{
 			DataSet ds1 = new DataSet();
@@ -2695,7 +2693,6 @@ namespace MonoTests_System.Data
 		}
 
 		[Test]
-		[Category ("NotWorking")]
 		public void ReadXml_ByTextReader()
 		{
 			DataSet ds1 = new DataSet();
@@ -2734,7 +2731,6 @@ namespace MonoTests_System.Data
 		}
 
 		[Test]
-		[Category ("NotWorking")]
 		public void ReadXml_ByXmlReader()
 		{
 			DataSet ds1 = new DataSet();