Fix Sampler State property

- Update to new shader library

MaterialGraphProject/Assets/UnityShaderEditor/Editor/Data/Graphs/SamplerStateShaderProperty.cs

 
         public override string GetPropertyDeclarationString(string delimiter = ";")
         {
-            return string.Format(@"SAMPLER2D({0}){1}", referenceName, delimiter);
+            return string.Format(@"SAMPLER({0}){1}", referenceName, delimiter);
         }
 
         public override PreviewProperty GetPreviewMaterialProperty()