Update slot name

com.unity.shadergraph/Editor/Data/Nodes/Input/Geometry/FaceSignNode.cs

 		public override bool hasPreview { get { return false; } }
 
 		public const int OutputSlotId = 0;
-        private const string kOutputSlotName = "Out";
+        private const string kOutputSlotName = "Is Front";
 
 		public override void UpdateNodeAfterDeserialization()
         {