Temprary restore ReadExternalEntities default true until fix unit test.

Author: claudiamurialdo

dotnet/src/dotnetframework/GxClasses/Domain/GXXmlReadWrite.cs

@@ -105,7 +105,7 @@ public GXXMLReader()
 			SimpleElements = 1;
 			RemoveWhiteNodes = 1;
 			RemoveWhiteSpaces = 1;
-			ReadExternalEntities = 0;
+			ReadExternalEntities = 1;
 			_basePath = "";
 
 		}